The relationship between onset of workplace violence and onset of sleep disturbances in the Swedish working population
J Sleep Res. 2021 Mar 3:e13307. doi: 10.1111/jsr.13307. Online ahead of print.ABSTRACTThe study investigated the association between onset of workplace violence and onset of sleep disturbances. We used self-reported data from the Swedish Longitudinal Occupational Survey of Health (SLOSH) collected in 2014, 2016, and 2018. A two-wave design was based on participants who had no exposure to workplace violence or sleep disturbances at baseline (n = 6,928). A three-wave design was based on participants who in addition were unexposed to sleep disturbances in the second wave (n = 6,150). Four items of the Karolinska Sleep Questio...
Source: Journal of Sleep Research - March 3, 2021 Category: Sleep Medicine Authors: Meike Heming Tianwei Xu Anna Nyberg Linda L Magnusson Hanson Source Type: research

The relationship between onset of workplace violence and onset of sleep disturbances in the Swedish working population
J Sleep Res. 2021 Mar 3:e13307. doi: 10.1111/jsr.13307. Online ahead of print.ABSTRACTThe study investigated the association between onset of workplace violence and onset of sleep disturbances. We used self-reported data from the Swedish Longitudinal Occupational Survey of Health (SLOSH) collected in 2014, 2016, and 2018. A two-wave design was based on participants who had no exposure to workplace violence or sleep disturbances at baseline (n = 6,928). A three-wave design was based on participants who in addition were unexposed to sleep disturbances in the second wave (n = 6,150). Four items of the Karolinska Sleep Questio...
Source: Journal of Sleep Research - March 3, 2021 Category: Sleep Medicine Authors: Meike Heming Tianwei Xu Anna Nyberg Linda L Magnusson Hanson Source Type: research

The effect of 5  nights of sleep restriction on empathic propensity
In conclusion, inter-individual variability should be taken into account when evaluating the effects of sleep restriction on empathic propensity. People with habitual higher tendency to empathise could choose to avoid empathic experience following several consecutive nights of inadequate sleep.PMID:33645860 | DOI:10.1111/jsr.13325 (Source: Journal of Sleep Research)
Source: Journal of Sleep Research - March 1, 2021 Category: Sleep Medicine Authors: Giulia Amicucci Daniela Tempesta Federico Salfi Aurora D'Atri Lorenzo Viselli Luigi De Gennaro Michele Ferrara Source Type: research

The effect of 5  nights of sleep restriction on empathic propensity
In conclusion, inter-individual variability should be taken into account when evaluating the effects of sleep restriction on empathic propensity. People with habitual higher tendency to empathise could choose to avoid empathic experience following several consecutive nights of inadequate sleep.PMID:33645860 | DOI:10.1111/jsr.13325 (Source: Journal of Sleep Research)
Source: Journal of Sleep Research - March 1, 2021 Category: Sleep Medicine Authors: Giulia Amicucci Daniela Tempesta Federico Salfi Aurora D'Atri Lorenzo Viselli Luigi De Gennaro Michele Ferrara Source Type: research

Insomnia symptoms and subclinical myocardial injury: Data from the Nord-Tr øndelag Health (HUNT) study
J Sleep Res. 2021 Feb 24:e13299. doi: 10.1111/jsr.13299. Online ahead of print.ABSTRACTInsomnia symptoms are associated with increased risk of heart failure (HF) and cardiovascular (CV) mortality. We hypothesised that insomnia symptoms are cross-sectionally associated with increased cardiac troponin I (cTnI), a biomarker of subclinical myocardial injury, and that phenotyping by insomnia symptoms and cTnI enhances longitudinal risk stratification in the general population. In a population-based study, cTnI was measured in 8,398 participants (median age 49 years, 55% women), who had answered questionnaires regarding insomnia...
Source: Journal of Sleep Research - February 25, 2021 Category: Sleep Medicine Authors: Fjola D Sigurdardottir Magnus N Lyngbakken Kristian Hveem Harald Hrubos Str øm Helge R øsjø Susan Redline Torbj ørn Omland Source Type: research

Acute and cumulative effects of scheduling on aircrew fatigue in ultra-short-haul operations
J Sleep Res. 2021 Feb 25:e13305. doi: 10.1111/jsr.13305. Online ahead of print.ABSTRACTAircrew fatigue constitutes a safety hazard in aviation, which authorities attempt to mitigate through flight time limitations. Some gaps in knowledge exist, however. The purpose of the present study was to investigate the associations of schedule characteristics with fatigue and amount of sleep in the acute 24-h window, and as cumulative effects across the 7-day work period. One hundred and six aircrew (14% cabin crew) participated. They rated fatigue on the Karolinska Sleepiness Scale (KSS) three times per flight day for four 7-day wor...
Source: Journal of Sleep Research - February 25, 2021 Category: Sleep Medicine Authors: Torbjorn Åkerstedt Tomas Klemets David Karlsson Henrike H äbel Linnea Widman Mikael Sallinen Source Type: research

Insomnia symptoms and subclinical myocardial injury: Data from the Nord-Tr øndelag Health (HUNT) study
J Sleep Res. 2021 Feb 24:e13299. doi: 10.1111/jsr.13299. Online ahead of print.ABSTRACTInsomnia symptoms are associated with increased risk of heart failure (HF) and cardiovascular (CV) mortality. We hypothesised that insomnia symptoms are cross-sectionally associated with increased cardiac troponin I (cTnI), a biomarker of subclinical myocardial injury, and that phenotyping by insomnia symptoms and cTnI enhances longitudinal risk stratification in the general population. In a population-based study, cTnI was measured in 8,398 participants (median age 49 years, 55% women), who had answered questionnaires regarding insomnia...
Source: Journal of Sleep Research - February 25, 2021 Category: Sleep Medicine Authors: Fjola D Sigurdardottir Magnus N Lyngbakken Kristian Hveem Harald Hrubos Str øm Helge R øsjø Susan Redline Torbj ørn Omland Source Type: research

Acute and cumulative effects of scheduling on aircrew fatigue in ultra-short-haul operations
J Sleep Res. 2021 Feb 25:e13305. doi: 10.1111/jsr.13305. Online ahead of print.ABSTRACTAircrew fatigue constitutes a safety hazard in aviation, which authorities attempt to mitigate through flight time limitations. Some gaps in knowledge exist, however. The purpose of the present study was to investigate the associations of schedule characteristics with fatigue and amount of sleep in the acute 24-h window, and as cumulative effects across the 7-day work period. One hundred and six aircrew (14% cabin crew) participated. They rated fatigue on the Karolinska Sleepiness Scale (KSS) three times per flight day for four 7-day wor...
Source: Journal of Sleep Research - February 25, 2021 Category: Sleep Medicine Authors: Torbjorn Åkerstedt Tomas Klemets David Karlsson Henrike H äbel Linnea Widman Mikael Sallinen Source Type: research

Insomnia symptoms and subclinical myocardial injury: Data from the Nord-Tr øndelag Health (HUNT) study
J Sleep Res. 2021 Feb 24:e13299. doi: 10.1111/jsr.13299. Online ahead of print.ABSTRACTInsomnia symptoms are associated with increased risk of heart failure (HF) and cardiovascular (CV) mortality. We hypothesised that insomnia symptoms are cross-sectionally associated with increased cardiac troponin I (cTnI), a biomarker of subclinical myocardial injury, and that phenotyping by insomnia symptoms and cTnI enhances longitudinal risk stratification in the general population. In a population-based study, cTnI was measured in 8,398 participants (median age 49 years, 55% women), who had answered questionnaires regarding insomnia...
Source: Journal of Sleep Research - February 25, 2021 Category: Sleep Medicine Authors: Fjola D Sigurdardottir Magnus N Lyngbakken Kristian Hveem Harald Hrubos Str øm Helge R øsjø Susan Redline Torbj ørn Omland Source Type: research

Acute and cumulative effects of scheduling on aircrew fatigue in ultra-short-haul operations
J Sleep Res. 2021 Feb 25:e13305. doi: 10.1111/jsr.13305. Online ahead of print.ABSTRACTAircrew fatigue constitutes a safety hazard in aviation, which authorities attempt to mitigate through flight time limitations. Some gaps in knowledge exist, however. The purpose of the present study was to investigate the associations of schedule characteristics with fatigue and amount of sleep in the acute 24-h window, and as cumulative effects across the 7-day work period. One hundred and six aircrew (14% cabin crew) participated. They rated fatigue on the Karolinska Sleepiness Scale (KSS) three times per flight day for four 7-day wor...
Source: Journal of Sleep Research - February 25, 2021 Category: Sleep Medicine Authors: Torbjorn Åkerstedt Tomas Klemets David Karlsson Henrike H äbel Linnea Widman Mikael Sallinen Source Type: research

Insomnia symptoms and subclinical myocardial injury: Data from the Nord-Tr øndelag Health (HUNT) study
J Sleep Res. 2021 Feb 24:e13299. doi: 10.1111/jsr.13299. Online ahead of print.ABSTRACTInsomnia symptoms are associated with increased risk of heart failure (HF) and cardiovascular (CV) mortality. We hypothesised that insomnia symptoms are cross-sectionally associated with increased cardiac troponin I (cTnI), a biomarker of subclinical myocardial injury, and that phenotyping by insomnia symptoms and cTnI enhances longitudinal risk stratification in the general population. In a population-based study, cTnI was measured in 8,398 participants (median age 49 years, 55% women), who had answered questionnaires regarding insomnia...
Source: Journal of Sleep Research - February 25, 2021 Category: Sleep Medicine Authors: Fjola D Sigurdardottir Magnus N Lyngbakken Kristian Hveem Harald Hrubos Str øm Helge R øsjø Susan Redline Torbj ørn Omland Source Type: research

Acute and cumulative effects of scheduling on aircrew fatigue in ultra-short-haul operations
J Sleep Res. 2021 Feb 25:e13305. doi: 10.1111/jsr.13305. Online ahead of print.ABSTRACTAircrew fatigue constitutes a safety hazard in aviation, which authorities attempt to mitigate through flight time limitations. Some gaps in knowledge exist, however. The purpose of the present study was to investigate the associations of schedule characteristics with fatigue and amount of sleep in the acute 24-h window, and as cumulative effects across the 7-day work period. One hundred and six aircrew (14% cabin crew) participated. They rated fatigue on the Karolinska Sleepiness Scale (KSS) three times per flight day for four 7-day wor...
Source: Journal of Sleep Research - February 25, 2021 Category: Sleep Medicine Authors: Torbjorn Åkerstedt Tomas Klemets David Karlsson Henrike H äbel Linnea Widman Mikael Sallinen Source Type: research

The association between eating frequency with alertness and gastrointestinal complaints in nurses during the night shift
J Sleep Res. 2021 Feb 23:e13306. doi: 10.1111/jsr.13306. Online ahead of print.ABSTRACTWe investigated the association of the number of eating occasions and energy intake with alertness and gastrointestinal (GI) complaints in nurses during their night shift. During this observational study we collected data on anthropometrics and demographics, eating frequency, energy intake, alertness and GI complaints in 118 healthy female nurses, aged 20 to 61 years. Nurses completed an alertness test (psychomotor vigilance task) during the night shift and a 24-hr dietary recall and a questionnaire about GI complaints after the night sh...
Source: Journal of Sleep Research - February 23, 2021 Category: Sleep Medicine Authors: Mari ëlle G de Rijk Alexander P J van Eekelen Elly Kaldenberg Sanne Boesveldt Wendy Te Woerd Tineke Holwerda Ceciel J M Lansink Edith J M Feskens Jeanne H M de Vries Source Type: research

Naps not as effective as a night of sleep at dissipating sleep pressure
In this study, we examined whether taking six naps throughout a 24-hr period would result in the same amount of dissipation of homeostatic pressure at the end of the day as a night of sleep, when time in bed is equivalent. Data from 46 participants (10-23 years; mean = 14.5 [± 2.9]; 25 females) were analysed. Slow-wave energy, normalized to account for individual differences in slow-wave activity, was used as a measure of sleep homeostasis. In the nap condition, slow-wave energy of six naps distributed equally during a 24-hr period was calculated. In the baseline condition, slow-wave energy was measured after 9-hr t...
Source: Journal of Sleep Research - February 23, 2021 Category: Sleep Medicine Authors: Leila Tarokh Eliza Van Reen Peter Achermann Mary A Carskadon Source Type: research

Revisiting nocturnal heart rate and heart rate variability in insomnia: A polysomnography-based comparison of young self-reported good and poor sleepers
J Sleep Res. 2021 Feb 23:e13278. doi: 10.1111/jsr.13278. Online ahead of print.ABSTRACTPrimary insomnia is often considered a disorder of 24-hr hyperarousal. Numerous attempts have been made to investigate nocturnal heart rate (HR) and its variability (HRV) as potential pathophysiological hallmarks of altered arousal levels in insomnia, with mixed results. We have aimed to overcome some of the pitfalls of previous studies by using a young, medication-free, age- and gender-matched population consisting of 43 students aged 18-30 years half with a subthreshold insomnia complaint. We employed at-home ambulatory polysomnography...
Source: Journal of Sleep Research - February 23, 2021 Category: Sleep Medicine Authors: Jan Cosgrave Jessica Phillips Ross Haines Russell G Foster David Steinsaltz Katharina Wulff Source Type: research

The association between eating frequency with alertness and gastrointestinal complaints in nurses during the night shift
J Sleep Res. 2021 Feb 23:e13306. doi: 10.1111/jsr.13306. Online ahead of print.ABSTRACTWe investigated the association of the number of eating occasions and energy intake with alertness and gastrointestinal (GI) complaints in nurses during their night shift. During this observational study we collected data on anthropometrics and demographics, eating frequency, energy intake, alertness and GI complaints in 118 healthy female nurses, aged 20 to 61 years. Nurses completed an alertness test (psychomotor vigilance task) during the night shift and a 24-hr dietary recall and a questionnaire about GI complaints after the night sh...
Source: Journal of Sleep Research - February 23, 2021 Category: Sleep Medicine Authors: Mari ëlle G de Rijk Alexander P J van Eekelen Elly Kaldenberg Sanne Boesveldt Wendy Te Woerd Tineke Holwerda Ceciel J M Lansink Edith J M Feskens Jeanne H M de Vries Source Type: research

Naps not as effective as a night of sleep at dissipating sleep pressure
In this study, we examined whether taking six naps throughout a 24-hr period would result in the same amount of dissipation of homeostatic pressure at the end of the day as a night of sleep, when time in bed is equivalent. Data from 46 participants (10-23 years; mean = 14.5 [± 2.9]; 25 females) were analysed. Slow-wave energy, normalized to account for individual differences in slow-wave activity, was used as a measure of sleep homeostasis. In the nap condition, slow-wave energy of six naps distributed equally during a 24-hr period was calculated. In the baseline condition, slow-wave energy was measured after 9-hr t...
Source: Journal of Sleep Research - February 23, 2021 Category: Sleep Medicine Authors: Leila Tarokh Eliza Van Reen Peter Achermann Mary A Carskadon Source Type: research

Revisiting nocturnal heart rate and heart rate variability in insomnia: A polysomnography-based comparison of young self-reported good and poor sleepers
J Sleep Res. 2021 Feb 23:e13278. doi: 10.1111/jsr.13278. Online ahead of print.ABSTRACTPrimary insomnia is often considered a disorder of 24-hr hyperarousal. Numerous attempts have been made to investigate nocturnal heart rate (HR) and its variability (HRV) as potential pathophysiological hallmarks of altered arousal levels in insomnia, with mixed results. We have aimed to overcome some of the pitfalls of previous studies by using a young, medication-free, age- and gender-matched population consisting of 43 students aged 18-30 years half with a subthreshold insomnia complaint. We employed at-home ambulatory polysomnography...
Source: Journal of Sleep Research - February 23, 2021 Category: Sleep Medicine Authors: Jan Cosgrave Jessica Phillips Ross Haines Russell G Foster David Steinsaltz Katharina Wulff Source Type: research

Neuronal activation and performance changes in working memory induced by chronic sleep restriction in adolescents
This study utilized functional magnetic resonance imaging to examine compensatory and diminished brain responses in adolescents during working memory performance, comparing chronic sleep restriction and healthy sleep duration. Thirty-six healthy adolescents, 14-17 years old, experienced a 3-week protocol: (a) sleep phase stabilization; (b) sleep restriction (~6.5 hr nightly); and (c) healthy sleep duration (~9 hr nightly). After each sleep manipulation, we acquired functional magnetic resonance imaging with an NBack working memory task with four difficulty levels (0 to 3-back). NBack performance degraded with higher task d...
Source: Journal of Sleep Research - February 22, 2021 Category: Sleep Medicine Authors: Maryam Alsameen Mark W DiFrancesco Sean P A Drummond Peter L Franzen Dean W Beebe Source Type: research

Neuronal activation and performance changes in working memory induced by chronic sleep restriction in adolescents.
This study utilized functional magnetic resonance imaging to examine compensatory and diminished brain responses in adolescents during working memory performance, comparing chronic sleep restriction and healthy sleep duration. Thirty-six healthy adolescents, 14-17 years old, experienced a 3-week protocol: (a) sleep phase stabilization; (b) sleep restriction (~6.5 hr nightly); and (c) healthy sleep duration (~9 hr nightly). After each sleep manipulation, we acquired functional magnetic resonance imaging with an NBack working memory task with four difficulty levels (0 to 3-back). NBack performance degraded wit...
Source: Journal of Sleep Research - February 21, 2021 Category: Sleep Medicine Authors: Alsameen M, DiFrancesco MW, Drummond SPA, Franzen PL, Beebe DW Tags: J Sleep Res Source Type: research

Severe effects of the COVID-19 confinement on young children's sleep: A longitudinal study identifying risk and protective factors.
h S Abstract The COVID-19 confinement has dramatically altered daily routines, causing decreased sleep quality in adults. This necessitates careful observation, as sleep plays a crucial role in brain maturation and poor sleep increases the risk of psychopathology, particularly in the young population. Through an online survey with one baseline (April 2020) and two follow-up assessments (May and June 2020), we examined the effect of confinement on sleep quality in 452 babies (0-35 months) and 412 preschool children (36-71 months) from several, mainly European, countries. An acute decrease in sleep quality...
Source: Journal of Sleep Research - February 18, 2021 Category: Sleep Medicine Authors: Markovic A, Mühlematter C, Beaugrand M, Camos V, Kurth S Tags: J Sleep Res Source Type: research

Working memory deficits in patients with idiopathic restless legs syndrome are associated with abnormal theta-band neural synchrony.
Abstract Cognitive impairment, particularly prefrontal function, has been reported in patients with restless legs syndrome. However, working memory performance in patients with restless legs syndrome remains uncertain. The present study aimed to examine working memory performance in patients with restless legs syndrome by investigating electroencephalography theta-band oscillations within task-relevant brain regions and the synchronization among oscillations during a working memory task. Twelve female idiopathic patients with restless legs syndrome and 12 female healthy controls participated in this study. Ninetee...
Source: Journal of Sleep Research - February 9, 2021 Category: Sleep Medicine Authors: Cha KS, Sunwoo JS, Byun JI, Kim TJ, Shin JW, Kim KH, Jung KY Tags: J Sleep Res Source Type: research

Grey matter alterations in restless legs syndrome: A coordinate-based meta-analysis.
Abstract Brain structural abnormalities in idiopathic restless legs syndrome have long been debated. Voxel-based morphometry is an objective structural magnetic resonance imaging technique to investigate regional grey matter volume or density differences between groups. In the last decade, voxel-based morphometry studies have exhibited inconsistent and conflicting findings regarding the presence and localization of brain grey matter alterations in restless legs syndrome. We therefore conducted a coordinate-based meta-analysis to quantitatively examine whether there were consistent grey matter findings in restless ...
Source: Journal of Sleep Research - February 8, 2021 Category: Sleep Medicine Authors: Sheng L, Zhao P, Ma H, Qi L, Yi Z, Shi Y, Zhong J, Shi H, Dai Z, Pan P Tags: J Sleep Res Source Type: research

Pandemic nightmares: Effects on dream activity of the COVID-19 lockdown in Italy.
Abstract COVID-19 has critically impacted the world. Recent works have found substantial changes in sleep and mental health during the COVID-19 pandemic. Dreams could give us crucial information about people's well-being, so here we have directly investigated the consequences of lockdown on the oneiric activity in a large Italian sample: 5,988 adults completed a web-survey during lockdown. We investigated sociodemographic and COVID-19-related information, sleep quality (by the Medical Outcomes Study-Sleep Scale), mental health (by the Depression, Anxiety, and Stress Scales), dream and nightmare frequency, and rela...
Source: Journal of Sleep Research - February 6, 2021 Category: Sleep Medicine Authors: Scarpelli S, Alfonsi V, Mangiaruga A, Musetti A, Quattropani MC, Lenzo V, Freda MF, Lemmo D, Vegni E, Borghi L, Saita E, Cattivelli R, Castelnuovo G, Plazzi G, De Gennaro L, Franceschini C Tags: J Sleep Res Source Type: research

Impact of continuous positive airway pressure mode on adherence to treatment in obstructive sleep apnea patients awaiting bariatric surgery.
The objective was to compare treatment adherence between automatic positive airway pressure and fixed positive airway pressure (continuous positive airway pressure) in obstructive sleep apnea patients awaiting bariatric surgery. This randomized controlled trial involved obese patients newly diagnosed with severe obstructive sleep apnea and awaiting bariatric surgery. The primary outcome was the difference in adherence between automatic positive airway pressure and continuous positive airway pressure pre-operatively. Secondary outcomes included positive airway pressure efficacy, adherence at 1 month, adverse effects, qual...
Source: Journal of Sleep Research - February 6, 2021 Category: Sleep Medicine Authors: Kermelly SB, Lajoie AC, Boucher ME, Sériès F Tags: J Sleep Res Source Type: research

Relative tidal volume and respiratory airflow estimation using tracheal sound and movement during sleep.
Abstract Airflow is the reference signal to assess sleep respiratory disorders, such as sleep apnea. Previous studies estimated airflow using tracheal sounds in short segments with specific airflow rates, while requiring calibration or a few breaths for tuning the relationship between sound energy and airflow. Airflow-sound relationship can change by posture, sleep stage and airflow rate or tidal volume. We investigated the possibility of estimating surrogates of tidal volume without calibration in the adult sleep apnea population using tracheal sounds and movements. Two surrogates of tidal volume: thoracoabdomina...
Source: Journal of Sleep Research - February 3, 2021 Category: Sleep Medicine Authors: Montazeri Ghahjaverestan N, Kabir MM, Saha S, Gavrilovic B, Zhu K, Taati B, Alshaer H, Yadollahi A Tags: J Sleep Res Source Type: research

Ambulatory blood pressure monitoring in children undergoing polysomnography.
Abstract Ambulatory blood pressure monitoring (ABPM) is recommended for the diagnosis of hypertension in children at high risk, such as children with obesity or obstructive sleep apnea (OSA). Nocturnal hypertension is highly predictive of cardiovascular outcomes. ABPM allows for early detection of nocturnal hypertension in children. Although OSA is the most common sleep disorder associated with hypertension, studies have also shown an increase in cardiovascular risk in adult patients with other sleep disorders; therefore, there is an imperative need to provide early diagnosis in children at high risk. In the prese...
Source: Journal of Sleep Research - February 3, 2021 Category: Sleep Medicine Authors: DelRosso LM, Chan J, Ruth C, Powell WT, Arp M, Hanevold C, Ferri R Tags: J Sleep Res Source Type: research

Imagery rehearsal therapy and/or mianserin in treatment of refugees diagnosed with PTSD: Results from a randomized controlled trial.
Abstract Sleep disturbances are frequently part of the symptomatology in refugees with post-traumatic stress disorder (PTSD). It has been suggested that targeting sleep disturbances may enhance the outcome of PTSD treatment. However, randomized studies on the effect of treatment focusing on sleep disturbances in refugees with PTSD are lacking. The aim of this study was to examine add-on treatment with imagery rehearsal therapy (IRT) and/or mianserin against treatment as usual (TAU) alone in a sample of trauma-affected refugees with PTSD at 8-12 months follow-up. In a randomized controlled trial, 219 adult ref...
Source: Journal of Sleep Research - February 2, 2021 Category: Sleep Medicine Authors: Sandahl H, Jennum P, Baandrup L, Lykke Mortensen E, Carlsson J Tags: J Sleep Res Source Type: research

Daily associations between sleep and pain in patients with chronic musculoskeletal pain.
In conclusion pain, sleep quality and mental distress are closely related, underscoring the importance of encompassing this complexity in assessment and treatment of patients with chronic pain. PMID: 33529464 [PubMed - as supplied by publisher] (Source: Journal of Sleep Research)
Source: Journal of Sleep Research - February 2, 2021 Category: Sleep Medicine Authors: Abeler K, Bergvik S, Sand T, Friborg O Tags: J Sleep Res Source Type: research

Influence of head flexion and rotation on obstructive sleep apnea severity during supine sleep.
The objective of this study was to develop and validate an instrument to measure head posture during supine sleep and to apply this instrument to investigate the influence of head posture on obstructive sleep apnea (OSA) severity. A customized instrument to quantify head flexion and rotation during supine sleep was developed and validated in a benchtop experiment. Twenty-eight participants with suspected OSA were successfully studied using diagnostic polysomnography with the addition of the customized instrument. Head posture in supine sleep was discretized into four categories by two variables: head flexed or not (flexion...
Source: Journal of Sleep Research - February 1, 2021 Category: Sleep Medicine Authors: Tate A, Kurup V, Shenoy B, Freakley C, Eastwood PR, Walsh J, Terrill P Tags: J Sleep Res Source Type: research

Sleep and COVID-19, the history of sleep, chronobiology and insomnia.
PMID: 33511735 [PubMed - in process] (Source: Journal of Sleep Research)
Source: Journal of Sleep Research - January 31, 2021 Category: Sleep Medicine Authors: Riemann D Tags: J Sleep Res Source Type: research

Low test-retest reliability of the Epworth Sleepiness Scale within a substantial short time frame.
We examined 100 unselected patients consecutively referred to the sleep laboratory with the ESS questionnaire, using a test-retest paradigm with an interval of 1 h between two ESS tests. The Lin's concordance coefficient was found to be low, whereas the Pearson's correlation revealed good reliability. Our result provides evidence on the poor test-retest reliability of the ESS, despite the examination protocol excluding changes in test circumstances. PMID: 33496000 [PubMed - as supplied by publisher] (Source: Journal of Sleep Research)
Source: Journal of Sleep Research - January 25, 2021 Category: Sleep Medicine Authors: Rozgonyi R, Dombi I, Janszky J, Kovács N, Faludi B Tags: J Sleep Res Source Type: research

Heart rate variability and obstructive sleep apnea: Current perspectives and novel technologies.
Abstract Obstructive sleep apnea (OSA) is a highly prevalent condition, resulting in recurrent hypoxic events, sleep arousal, and daytime sleepiness. Patients with OSA are at an increased risk of cardiovascular morbidity and mortality. The mechanisms underlying the development of cardiovascular disease in OSA are multifactorial and cause a cascade of events. The primary contributing factor is sympathetic overactivity. Heart rate variability (HRV) can be used to evaluate shifts in the autonomic nervous system, during sleep and in response to treatment in patients with OSA. Newer technologies are aimed at improving ...
Source: Journal of Sleep Research - January 18, 2021 Category: Sleep Medicine Authors: Ucak S, Dissanayake HU, Sutherland K, de Chazal P, Cistulli PA Tags: J Sleep Res Source Type: research

Sleep and emotion processing in paediatric posttraumatic stress disorder: A pilot investigation.
Abstract Emotion processing abnormalities and sleep pathology are central to the phenomenology of paediatric posttraumatic stress disorder, and sleep disturbance has been linked to the development, maintenance and severity of the disorder. Given emerging evidence indicating a role for sleep in emotional brain function, it has been proposed that dysfunctional processing of emotional experiences during sleep may play a significant role in affective disorders, including posttraumatic stress disorder. Here we sought to examine the relationship between sleep and emotion processing in typically developing youth, and you...
Source: Journal of Sleep Research - January 13, 2021 Category: Sleep Medicine Authors: Jones S, Castelnovo A, Riedner B, Flaherty B, Prehn-Kristensen A, Benca R, Tononi G, Herringa R Tags: J Sleep Res Source Type: research

Maintaining normal sleep patterns, lifestyles and emotion during the COVID-19 pandemic: The stabilizing effect of daytime napping.
This study aimed to assess changes in sleep pattern and their influence on people's daily life and emotion during the COVID-19 pandemic. Self-developed questionnaires were used to measure changes in nocturnal sleep, daytime napping, lifestyles and negative emotions in individuals before and after the COVID-19 pandemic. Nine hundred and thirty effective questionnaires were collected in this study. Repeated measures analysis of variance and hierarchical regression analysis were applied. We found that individuals' sleep rhythms were delayed, and sleep duration and sleep latency were increased during the stay-at-home orders. M...
Source: Journal of Sleep Research - January 8, 2021 Category: Sleep Medicine Authors: Dai W, Zhou J, Li G, Zhang B, Ma N Tags: J Sleep Res Source Type: research

Effect of the novel dual orexin receptor antagonist daridorexant on night-time respiratory function and sleep in patients with moderate chronic obstructive pulmonary disease.
In conclusion, single and multiple doses of 50 mg daridorexant do not impair night-time respiratory function and improves sleep in patients with moderate COPD. PMID: 33417730 [PubMed - as supplied by publisher] (Source: Journal of Sleep Research)
Source: Journal of Sleep Research - January 8, 2021 Category: Sleep Medicine Authors: Boof ML, Dingemanse J, Brunke M, Esselmann A, Heymer P, Kestermann O, Lederer K, Fietze I, Ufer M Tags: J Sleep Res Source Type: research

Sleep, academic achievement, and cognitive performance in children with attention-deficit hyperactivity disorder: A polysomnographic study.
In conclusion, sleep parameters are closely associated with the academic and cognitive functioning of children with ADHD. PMID: 33410226 [PubMed - as supplied by publisher] (Source: Journal of Sleep Research)
Source: Journal of Sleep Research - January 7, 2021 Category: Sleep Medicine Authors: Ruiz-Herrera N, Guillén-Riquelme A, Díaz-Román A, Buela-Casal G Tags: J Sleep Res Source Type: research

A real-time sleep scoring framework for closed-loop sleep manipulation in mice.
Abstract Subtle changes in sleep architecture can accompany and be symptomatic of many diseases or disorders. In order to probe and understand the complex interactions between sleep and health, the ability to model, track, and modulate sleep in preclinical animal models is vital. While various methods have been described for scoring experimental sleep recordings, few are designed to work in real time - a prerequisite for closed-loop sleep manipulation. In the present study, we have developed algorithms and software to classify sleep in real time and validated it on C57BL/6 mice (n = 8). Hidden Markov mod...
Source: Journal of Sleep Research - January 6, 2021 Category: Sleep Medicine Authors: Huffman D, Ajwad A, Yaghouby F, O'Hara BF, Sunderam S Tags: J Sleep Res Source Type: research

Reply to Joyce et al.
PMID: 33368786 [PubMed - as supplied by publisher] (Source: Journal of Sleep Research)
Source: Journal of Sleep Research - December 27, 2020 Category: Sleep Medicine Authors: Kahn PA, Knauert MP Tags: J Sleep Res Source Type: research

Sleep in older adolescents. Results from a large cross-sectional, population-based study.
Abstract The aim of the present study was to describe sleep patterns in a large and representative sample of Norwegian adolescents. The sample included 4,010 first-year high school students, aged 16-17 years (54% female), who completed a web-based survey on sleep patterns. The process of going to sleep was addressed as a two-step sequence of (a) shuteye latency (interval from bedtime to shuteye time) and (b) sleep onset latency (interval from shuteye time to sleep onset). Results showed that 84.8% of the adolescents failed to obtain the recommended amount of sleep (8+ h) on schooldays, and 49.4% obtained...
Source: Journal of Sleep Research - December 21, 2020 Category: Sleep Medicine Authors: Saxvig IW, Bjorvatn B, Hysing M, Sivertsen B, Gradisar M, Pallesen S Tags: J Sleep Res Source Type: research

Impact of menstrual cycle phase and oral contraceptives on sleep and overnight memory consolidation.
Abstract Sleep spindles benefit declarative memory consolidation and are considered to be a biological marker for general cognitive abilities. However, the impact of sexual hormones and hormonal oral contraceptives (OCs) on these relationships are less clear. Thus, we here investigated the influence of endogenous progesterone levels of naturally cycling women and women using OCs on nocturnal sleep and overnight memory consolidation. Nineteen healthy women using OCs (MAge  = 21.4, SD = 2.1 years) were compared to 43 healthy women with a natural menstrual cycle (follicular phase: n =&nb...
Source: Journal of Sleep Research - December 21, 2020 Category: Sleep Medicine Authors: Plamberger CP, Van Wijk HE, Kerschbaum H, Pletzer BA, Gruber G, Oberascher K, Dresler M, Hahn MA, Hoedlmoser K Tags: J Sleep Res Source Type: research

Neurobehavioural functions during variable and stable short sleep schedules.
Abstract We investigated whether variable sleep schedules might mitigate the neurobehavioural deficits induced by multiple nights of sleep restriction. In this 4-night experiment, 78 young adults (age: 18-28 years) were randomly assigned to four groups: 8888, 8666, 8846 and 8486, where each digit corresponded to time-in-bed in hours for each study night. After one baseline night of 8-hr time-in-bed, time-in-bed remained unchanged for the 8888 group, while the other groups had short sleep schedules (total time-in-bed = 18 hr) that differed in the number of time-in-bed changes. Sleep was monitored usi...
Source: Journal of Sleep Research - December 16, 2020 Category: Sleep Medicine Authors: Koa TB, Lo JC Tags: J Sleep Res Source Type: research

Prenatal maternal sleep and trajectories of postpartum depression and anxiety symptoms.
Abstract Postpartum emotional distress is very common, with 10%-20% of postpartum women reporting depressive or anxiety disorders. Sleep is a modifiable risk factor for emotional distress that has a pivotal role in postpartum adjustment. The present study aimed to examine whether sleep duration and quality during pregnancy predict trajectories of emotional distress in the postpartum period. Participants were 215 women that were assessed from the third trimester of pregnancy to 18-months postpartum. At all five time points (third trimester, 3-, 6-, 12-, and 18-months postpartum), measures of sleep duration and qual...
Source: Journal of Sleep Research - December 15, 2020 Category: Sleep Medicine Authors: Gueron-Sela N, Shahar G, Volkovich E, Tikotzky L Tags: J Sleep Res Source Type: research

The effect of acute morphine on sleep in male patients suffering from sleep apnea: Is there a genetic effect? An RCT Study.
Abstract Questionnaire-based studies have suggested genetic differences in sleep symptoms in chronic opioid users. The present study aims to investigate if there is a genetic effect on sleep architecture and quantitative electroencephalogram (EEG) in response to acute morphine. Under a randomized, double-blind, placebo-controlled, crossover design, 68 men with obstructive sleep apnea undertook two overnight polysomnographic studies conducted at least 1 week apart. Each night they received either 40 mg of controlled-release morphine or placebo. Sleep architecture and quantitative EEG were compared between...
Source: Journal of Sleep Research - December 14, 2020 Category: Sleep Medicine Authors: Rowsell L, Wu JG, Yee BJ, Wong KKH, Sivam S, Somogyi AA, Grunstein RR, Wang D Tags: J Sleep Res Source Type: research

Communication during the initial visit to a CPAP clinic Practitioners' experiences of facilitators and barriers when talking to patients with obstructive sleep apnea.
r M Abstract Adherence to continuous positive airway pressure treatment for obstructive sleep apnea tends to be poor. Communication influences adherence but has not previously been investigated from a practitioner perspective, although shared decision-making is known to be of great importance. The aim was to describe how practitioners experience communication with patients with obstructive sleep apnea during the initial visit at a continuous positive airway pressure treatment clinic, with focus on facilitators and barriers related to the 4 Habits Model, a communication model comprised of four types of interrelated...
Source: Journal of Sleep Research - December 13, 2020 Category: Sleep Medicine Authors: Broström A, Fridlund B, Fossum B, Pakpour A, Nilsen P, Ulander M Tags: J Sleep Res Source Type: research

Tibialis anterior electromyographic bursts during sleep in histamine-deficient mice.
Abstract Antihistamine medications have been suggested to elicit clinical features of restless legs syndrome. The available data are limited, particularly concerning periodic leg movements during sleep, which are common in restless legs syndrome and involve bursts of tibialis anterior electromyogram. Here, we tested whether the occurrence of tibialis anterior electromyogram bursts during non-rapid eye movement sleep is altered in histidine decarboxylase knockout mice with congenital histamine deficiency compared with that in wild-type control mice. We implanted six histidine decarboxylase knockout and nine wild-ty...
Source: Journal of Sleep Research - December 13, 2020 Category: Sleep Medicine Authors: Berteotti C, Lo Martire V, Alvente S, Bastianini S, Matteoli G, Ohtsu H, Lin JS, Silvani A, Zoccoli G Tags: J Sleep Res Source Type: research

The acute effects of sleep restriction therapy for insomnia on circadian timing and vigilance.
Abstract Sleep-restriction therapy (SRT) has been shown to improve insomnia symptoms by restricting sleep opportunity. Curtailment of time in bed affects the duration and consolidation of sleep, but also its timing. While recent work suggests that people with insomnia are characterised by misalignment between circadian and behavioural timing of sleep, no study has investigated if SRT modifies this relationship. The primary aim of the present study was to examine change in phase angle after 2 weeks of SRT. As a secondary aim, we also sought to assess the effect of SRT on psychomotor vigilance. After a 1-week b...
Source: Journal of Sleep Research - December 13, 2020 Category: Sleep Medicine Authors: Maurer LF, Ftouni S, Espie CA, Bisdounis L, Kyle SD Tags: J Sleep Res Source Type: research

Acute blockade of NR2C/D subunit-containing N-methyl-D-aspartate receptors modifies sleep and neural oscillations in mice.
Lendvai B, Kiss T Abstract N-methyl-d-aspartate receptors (NMDARs) play an important role in excitatory neurotransmission and have been associated with psychiatric conditions including schizophrenia and major depressive disorder. NMDARs are composed of two NR1 and two NR2 subunits. The type of NR2 subunit determines electrophysiological and pharmacological properties of the receptor. As the precise role of NR2C/D subunit-containing NMDARs is poorly understood in vivo, we have performed behavioural, quantitative electroencephalographic (qEEG) and polysomnographic analysis following acute pharmacological blockade of...
Source: Journal of Sleep Research - December 13, 2020 Category: Sleep Medicine Authors: Pálfi E, Lévay G, Czurkó A, Lendvai B, Kiss T Tags: J Sleep Res Source Type: research

Effects of oral appliance treatment on inflammatory biomarkers in obstructive sleep apnea: A randomised controlled trial.
ing; Abstract Obstructive sleep apnea (OSA) may lead to increased circulating concentrations of inflammatory biomarkers and treatment may change these. We aimed to assess the effect of oral appliance (OA) therapy on inflammatory biomarkers in a randomised controlled pilot trial. A total of 71 patients with OSA and systemic hypertension were randomly allocated to an active, mandible protruded (OAa) or a passive, mandible non-protruded device (OAp) treatment. Serum concentrations of the inflammatory biomarkers white blood cells, high-sensitivity C-reactive protein, interleukin 6, interleukin 10, and tumour necrosis ...
Source: Journal of Sleep Research - December 9, 2020 Category: Sleep Medicine Authors: Hedberg P, Nohlert E, Tegelberg Å Tags: J Sleep Res Source Type: research

The association between plasma metabolites and sleep quality in the Southall and Brent Revisited (SABRE) Study: A cross-sectional analysis.
We examined the association between plasma metabolites and abnormal sleep patterns using data from the Southall and Brent REvisited (SABRE) cohort. Nuclear magnetic resonance spectroscopy provided 146 circulating plasma metabolites. Sleep questionnaires identified the presence or absence of: difficulty falling asleep, early morning waking, waking up tired, and snoring. Metabolites were compared between the sleep quality categories using the t test, and then filtered using a false discovery rate of 0.05. Generalised linear models with logit-link assessed the associations between filtered metabolites and sleep phenotypes. Ad...
Source: Journal of Sleep Research - December 6, 2020 Category: Sleep Medicine Authors: Topriceanu CC, Tillin T, Chaturvedi N, Joshi R, Garfield V Tags: J Sleep Res Source Type: research