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Abstract：
In a group of 6 male subjects sleep was displaced to seven different times of day (one displacement condition per week). The subjects were isolated from external time cues (daylight, clocks, noise) and sleep was allowed to terminate spontaneously. The results showed a pronounced time-of-day variation of total sleep time, stage 2, and rapid eye movement (REM) sleep. Maxima occurred after bedtimes at 1900 hr and 2300 hr, while the minima occurred after bedtimes at 0700 hr and 1100 hr. The latter also was the time of maximum propensity to wake up. Slow wave sleep showed a rapid decrease from high initial levels, irrespective of time of day. Ratings of sleepiness showed a highly significant circadian variation peaking between 0500 hr and 0700 hr. The lowest level of sleepiness coincided with the maximum tendency to wake up, and it was suggested that sleep termination may be closely related to the sleepiness/alertness rhythm.
摘要：
在一组6名男性受试者中，睡眠被移位到一天中的七个不同时间（每周一次移位）。受试者与外部时间线索(日光，时钟,噪音)，并允许睡眠自发终止。结果表明，总睡眠时间的一天中的时间变化明显，阶段2和快速眼动（REM）睡眠。Maxima发生在1900小时和2300小时就寝时间后，而最小值发生在睡觉后的0700小时和1100小时。后者也是最容易醒来的时间。慢波睡眠显示从高初始水平迅速下降，无论一天中的时间。嗜睡的等级显示出高度显着的昼夜节律变化，在0500小时至0700小时之间达到峰值。最低程度的困倦与最大的醒来趋势相吻合，提示睡眠终止可能与嗜睡/警觉节律密切相关。
