Prolonged partial obstruction during sleep is a NREM phenomenon

Conclusion PPO evolved in NREM sleep and especially in N3 indicating that upper airway obstruction does not always ameliorate in deep sleep but changes the type. Even if PPO + OSA-patients had N3, their NREM sleep was lighter in three EEG locations. This might reflect impaired recovery function of sleep.
Source: Respiratory Physiology and Neurobiology - Category: Respiratory Medicine Source Type: research