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Seasonality in human sleep |
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| Authors: | M Kohsaka N Fukuda K Honma S Honma N Morita |
| Institution: | (1) Department of Psychiatry and Neurology, Hokkaido University School of Medicine, 060 Sapporo, Japan;(2) College of Medical Technology, Hokkaido University, 060 Sapporo, Japan;(3) Department of Physiology, Hokkaido University School of Medicine, 060 Sapporo, Japan |
| Abstract: | The timing of sleep and sleep EEG parameters in 10 healthy male subjects were investigated in four seasons under controlled conditions. The phase of nocturnal sleep was delayed about one and a half hours in winter as compared to that in summer. The duration of stage 4 sleep decreased and REM sleep increased significantly in winter compared with summer. The seasonality in the timing of sleep can be explained by photoperiodic time cues, but the changes in sleep EEG parameters are diffucult to explain in terms of photoperiod. |
| Keywords: | Human sleep slow wave sleep REM sleep circadian rhythm photoperiod seasonal variation timing of sleep |
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