Matsumoto K, Morita Y
Department of Hygiene, Kyorin University School of Medicine, Tokyo, Japan.
Sleep. 1987 Dec;10(6):580-9.
The effects of nighttime nap and age on sleep patterns of shift workers were examined for two groups of young and older guards working a 24-h shift with a nighttime nap of approximately 3.2 h. For both groups, day sleep was reduced by approximately 4.1 h, mainly affecting stage 2 sleep, slow wave sleep (SWS), and REM sleep. The totals of the different sleep stages of the nighttime nap plus day sleep were shorter than those of the control night only in stage 2 sleep. The nighttime nap appears to compensate for the sleep loss caused by night duty. During day sleep, the older subjects had relatively more awakenings and stage shifts. In the older group, the acrophase of oral temperature exhibited a significant phase advance of circadian rhythm, with reductions of means in the mesor and amplitude. Morningness-eveningness questionnaires tended to show higher scores (morningness) for the older group. From these results, it was determined that for older workers, an aberration in the phase of the circadian rhythm would slightly increase the difficulty of day sleep following night duty.
研究了夜间小睡和年龄对两组年轻和年长警卫轮班工作睡眠模式的影响，这两组警卫进行24小时轮班，夜间小睡约3.2小时。对于两组来说，白天睡眠减少了约4.1小时，主要影响2期睡眠、慢波睡眠（SWS）和快速眼动睡眠。夜间小睡加白天睡眠的不同睡眠阶段总数仅在2期睡眠中比对照夜短。夜间小睡似乎可以弥补夜班造成的睡眠损失。在白天睡眠期间，年长受试者有相对更多的觉醒和睡眠阶段转换。在年长组中，口腔温度的高峰相位表现出昼夜节律的显著相位提前，中值和振幅的平均值降低。晨型-夜型问卷倾向于显示年长组得分更高（晨型）。从这些结果可以确定，对于年长工人来说，昼夜节律相位的异常会稍微增加夜班后白天睡眠的难度。
