睡眠時刻の推移にともなう覚醒レベルの変化とその後の睡眠のパターンとの関係

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The relationship between decrease in cerebral arousal level and sleep stage pattern was examined when a cycle of 22h-wake and 8h-sleep was repeated four times. The subjects of the experiment were six healthy male university students. The results of the experiment showed that the period between the time when the average score of Stanford Sleepiness Scale (SSS) reached point four (a little foggy) and the rising time was gradually decreased by repetition of the 22h-wake and 8h-sleep cycle. It was also found that the average score for the 6th experimental day after the third cycle was significantly increased, compared with that for the 1st 22h waking period. These results show that the cerebral arousal level, which was indicated on the scores of SSS, was gradually decreased under the present experimental wake-sleep condition. The day-to-day variation of critical fusion frequency showed a tendency similar to that of SSS, demonstrating a gradual decrease in arousal level. On the other hand, stage 4 sleep (S4) was significantly increased during sleep after the 1st 22h waking period, compared with baseline sleep after 16h waking time. However, a significant increase in S4 was not seen during the sleeping periods in the second to the fourth cycles of 22h-wake and 8h-sleep, compared with that during the sleep after the 1st 22h waking period. These results suggest that, with respect to the 1st cycle of 22h-wake and 8h-sleep, the increase in S4 was related to the decreased level of arousal which was caused by a long prior wakefulness of 22h. However, our results also suggest that a further decrease in arousal level due to the repetitive cycles did not increase the amount of S4.
社団法人日本産業衛生学会の論文
1988-09-20

睡眠時刻の推移にともなう覚醒レベルの変化とその後の睡眠のパターンとの関係

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