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KMID : 0368819920310010182
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Journal of the Korean Neuropsychiatr Association
1992 Volume.31 No. 1 p.182 ~ p.194
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A Case of Delayed Sleep Phase Syndrome.
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Abstract
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Whereas insomnia (disorders of initiating and maintaining sleep) and hypersomnia(disorders of excessive somnolence) have been studied for many centuries, physicians only recently become aware of that the sleep-wake rhythm itself can also be
disturbed.
Indeed. At this time we an only dimly perceive the importance of circadian rhythm for healthful sleeping. Not only do our internal circadian rhythm have to be properly entrained to the 24-hour cycling of this it also seems crucial that an
individual' s
usual bedtime hours be properly located within that individual' s circadian rhythm.
Delayed sleep phase syndrome is one of disorders of the sleep- wake schedule, which usually arises from mismatches between the patients circadian rhythm and society' s timetable.
We experienced a case of salary man who developed delayed sleep phase syndrome for about one year. He had considerable difficulty in falling asleep at appropriated time in the night and increasing difficulty in awakening in the next morning. When
not on
a strict schedule(eg, weekends, holidays). He had a normal sleep pattern and after a sleep of normal length awaked spontaneously and felt refreshed. Polysomnographic recordings performed in our of sleep and awaking time. There was no evidence of
significant organic diseases excepthepatitis type B. Past history revealed no previous psychiatric disorders and no family history of psychiatric disorders.
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KEYWORD
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