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Sleep disorders characterized by disturbed circadian rhythm. Yasuo HISHIKAWA 1 1Department of Neuropsychiatry, Akita University School of Medicine pp.1001-1009
Published Date 1992/12/10
DOI https://doi.org/10.11477/mf.1431900298
  • Abstract
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Circadian rhythm is found in many biological functions including sleep-waking, behavioral rest-activity pattern, and endocrine and automonic functions of man and animals. Circadian rhythm of sleep-waking is very important for healthy life adapted to the natural and social environments. In normal persons under ordinary environments, circadian sleep-wake rhythm has the period of 24 hrs. Under the circumstances deprived of the time cues such as light-dark rhythm, social activities and in-formation on clock time, the period of circadian sleep-wake rhythm is prolonged to about 25 hrs in the majority of normal persons (Weber 1979).

Among different kinds of sleep disorders in man, there is a group of sleep disorders characterized by disturbed circadian rhythm. They are jet-lag syndrome, shift work sleep disorder, irregular sleep-wake pattern, advanced sleep phase syndrome, delayed sleep phase syndrome and non-24 hrs sleep-wake rhythm syndrome. The former two circadian rhythm sleep disorders, jet lag syndrome and shift work sleep disorder, are caused by the modern way of human activities which disturb the regular circadian sleep-wake pattern in man. These two circadian rhythm sleep disorders are usually transient, lasting a few to several days. However, the other circadian rhythm sleep disorders are usually chronic, lasting for many months and years, and often seriously disturb the social life of patients. Other clinical and chronobiological features of these circadian rhythm sleep disorders as well as therapeutic measures available at present for them are reviewed.


Copyright © 1992, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1243 印刷版ISSN 0001-8724 医学書院

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