, Volume 48, Issue 3, pp 231–233 | Cite as

Seasonality in human sleep

  • M. Kohsaka
  • N. Fukuda
  • K. Honma
  • S. Honma
  • N. Morita


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.

Key words

Human sleep slow wave sleep REM sleep circadian rhythm photoperiod seasonal variation timing of sleep 


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Copyright information

© Birkhäuser Verlag 1992

Authors and Affiliations

  • M. Kohsaka
    • 1
  • N. Fukuda
    • 2
  • K. Honma
    • 3
  • S. Honma
    • 3
  • N. Morita
    • 1
  1. 1.Department of Psychiatry and NeurologyHokkaido University School of MedicineSapporoJapan
  2. 2.College of Medical TechnologyHokkaido UniversitySapporoJapan
  3. 3.Department of PhysiologyHokkaido University School of MedicineSapporoJapan

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