Do urban fish exhibit impaired sleep?

(Forschungsverbund Berlin) Melatonin controls the body clock -- high melatonin levels make us feel tired in the evening. However, the hormone also plays an important role in animals' biological rhythms. Artificial light at night -- light pollution -- can suppress the production of melatonin in fish, even at very low light intensities, a finding established by researchers from the Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB).
Source: EurekAlert! - Biology - Category: Biology Source Type: news