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.
小睡是短暫的睡眠段落，在默認的時程中通常為20分鐘左右。小睡可以讓人獲得少量的REM。此外，小睡有助睡眠者在主段睡眠之間保持清醒。較長的小睡（長達約45分鐘，稱為Pronap）可以被安排在黎明前後的REM高峰期中，以獲得更多的REM睡眠。在一天中的其他時間安排較長的小睡可能會導致SWS覺醒，特別是在SWS不足較嚴重的時期，一些人可能特別難以醒來。
