Robert S, Dallaire A
Physiol Behav. 1986;37(2):289-93. doi: 10.1016/0031-9384(86)90235-0.
Electrocorticography and concurrent electromyography were used during a total of nineteen 24 hr periods in three juvenile pigs in order to establish the quantitative duration of the sleep-wake states and the REM sleep cycles. Wakefulness (W), drowsiness (DR), slow-wave sleep (SWS) and paradoxical sleep (REM) occupied respectively 46.5%, 15.9%, 26.7% and 10.9% of the 24 hr period. Mean duration of episodes was 4.1 min for DR, 6.2 min for SWS and 3.3 min for REM. Sleep cycles (SC) duration was 13.1 min. Near 80% of the SC were nocturnal. Analysis of variance showed a significant difference between diurnal and nocturnal duration of SC (day less than night), as well as between day-time and night-time duration of DR (day greater than night), SWS (day less than night) and REM (day less than night). A strong negative correlation was also found between the mean duration of SC and the number of SC per day.
为确定睡眠-觉醒状态及快速眼动睡眠周期的定量持续时间，在三只幼年猪的总共19个24小时时间段内使用了皮质脑电图和同步肌电图。清醒（W）、嗜睡（DR）、慢波睡眠（SWS）和异相睡眠（REM）分别占24小时时间段的46.5%、15.9%、26.7%和10.9%。DR发作的平均持续时间为4.1分钟，SWS为6.2分钟，REM为3.3分钟。睡眠周期（SC）持续时间为13.1分钟。近80%的睡眠周期为夜间睡眠周期。方差分析显示，睡眠周期的昼夜持续时间之间存在显著差异（白天短于夜间），以及DR、SWS和REM的白天和夜间持续时间之间存在显著差异（DR白天长于夜间，SWS和REM白天短于夜间）。还发现睡眠周期的平均持续时间与每天的睡眠周期数量之间存在强烈的负相关。
