Liamin O I, Mukhametov L M
Zh Vyssh Nerv Deiat Im I P Pavlova. 2013 Jan-Feb;63(1):61-74. doi: 10.7868/s0044467713010097.
Over the course of evolution, cetaceans have adapted to sleep in conditions that can be considered extreme for warm-blooded and air breathing animals. Studies of sleep in cetaceans have led to the discovery of an unusual type of sleep called unihemispheric slow wave sleep. The ability of cetaceans to sleep during swimming and to close only one eye at a time are two other features of their sleep, directly related to its unihemispheric nature. Paradoxical sleep in the form it is recorded in all terrestrial mammals is absent in cetaceans. The pattern of sleep in cetaceans allows them to 1) monitor the environment for predators and conspecifics to maintain group coherence, 2) surface regularly for breathing and 3) maintain effective thermoregulation.
在进化过程中，鲸类已经适应在对于温血且呼吸空气的动物而言可被视为极端的条件下睡眠。对鲸类睡眠的研究促成了一种名为单半球慢波睡眠的特殊睡眠类型的发现。鲸类在游泳时睡眠以及一次仅闭上一只眼睛的能力是其睡眠的另外两个特征，这与睡眠的单半球性质直接相关。鲸类不存在所有陆生哺乳动物所记录的那种形式的快速眼动睡眠。鲸类的睡眠模式使它们能够：1）监测环境以防范捕食者和同类，从而维持群体凝聚力；2）定期浮出水面呼吸；3）保持有效的体温调节。
