Naps are short blocks of sleep, typically about 20 minutes on default schedules. Naps allow for a small amount of REM to be gained. Moreover, naps help sleepers sustain wakefulness through gaps. Longer naps (up to ~45 minutes, known as [[Special:MyLanguage/pronap|pronap]]<nowiki/>s) can be used in during the REM peak around dawn to gain even more time in REM. Longer naps in other times of the day can lead to SWS wakes, which can be exceptionally difficult to wake from for some people, especially during periods of high SWS deficit.
小睡是短暂的睡眠段落，在默认的时程中通常为20分钟左右。小睡可以让人获得少量的REM。此外，小睡有助睡眠者在主段睡眠之间保持清醒。较长的小睡（长达约45分钟，称为Pronap）可以被安排在黎明前后的REM高峰期中，以获得更多的REM睡眠。在一天中的其他时间安排较长的小睡可能会导致SWS觉醒，特别是在SWS不足较严重的时期，一些人可能特别难以醒来。
