Lucas E A, Powell E W, Murphree O D
Physiol Behav. 1977 Aug;19(2):285-91. doi: 10.1016/0031-9384(77)90340-7.
The 24-hr electrographic patterns (EEG, EOG, EMG) of six normal pointer dogs were recorded in a laboratory setting. Two states of sleep (slow-wave and rapid eye movement) and wakefulness (alert and drowsy) were identified. The total recording period comprised 44% of alert wakefulness, 21% of the drowsy state, while slow-wave sleep occupied 23% and REM sleep 12% of the time. The mean length of a REM sleep episode averaged 6 min and the mean REM sleep cycle was 20 min. The mean polycyclic sleep-wake cycle was 83 min. Sleep episodes averaged 45 min and the mean waking episode was 38 min. There was an average of two REM sleep episodes per sleep-wake cycle. The dog has a propensity to sleep over a 16-hr interval from 1300 to 0500 but the most sleep occurred between 2100 and 0400 hr during darkness.
在实验室环境中记录了6只正常指示犬的24小时脑电图模式（脑电图、眼电图、肌电图）。确定了两种睡眠状态（慢波睡眠和快速眼动睡眠）以及清醒状态（警觉和困倦）。总记录时间中，警觉清醒占44%，困倦状态占21%，慢波睡眠占23%，快速眼动睡眠占12%。快速眼动睡眠发作的平均时长为6分钟，快速眼动睡眠周期平均为20分钟。多周期睡眠-清醒周期平均为83分钟。睡眠发作平均时长为45分钟，清醒发作平均时长为38分钟。每个睡眠-清醒周期平均有两次快速眼动睡眠发作。犬类倾向于在13:00至05:00的16小时时间段内睡眠，但在黑暗中的21:00至04:00期间睡眠最多。
