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NREM第二阶段是比第一阶段更深的睡眠，占总睡眠的45至55%。与NREM1相比，在NREM2中更难被唤醒。这个阶段的特征是[[Wikipedia:K-complex|K-复合波]]和[[Wikipedia:sleep spindles|睡眠梭状波]]，即Alpha波活动的突然中断。这阶段的睡眠也负责维持长时间的清醒状态。  

NREM第二阶段是比第一阶段更深的睡眠，占总睡眠的45至55%。与NREM1相比，在NREM2中更难被唤醒。这个阶段的特征是[[Wikipedia:K-complex|K-复合波]]和[[Wikipedia:sleep spindles|睡眠梭状波]]，即Alpha波活动的突然中断。这阶段的睡眠也负责维持长时间的清醒状态。  

NREM第三阶段占总睡眠的15至25%，是所有睡眠阶段中最深的阶段。这个阶段主要包含高振幅和低频率的[[Wikipedia:delta waves|Delta波]]。因此，它也被称为慢波睡眠（SWS）。要从这个阶段中醒来是非常困难的。试图这样做往往会导致一段强烈的呆滞和认知功能受损的时期——[[Special:MyLanguage/sleep inertia|睡眠惰性]]（sleep inertia）。 NREM3通过[[Wikipedia:Glymphatic system|胶淋巴系统]]（glymphatic system）在维护大脑方面发挥着关键作用。这过程需要约30至60分钟的连续的NREM3才能完成，因此只包含短暂小睡的时程可能会阻碍到此功能。

NREM Stage 3, accounting for 15-25% of total sleep, is the deepest of all sleep stages. This stage contains primarily [[Wikipedia:delta waves|delta waves]], which are high-amplitude and low-frequency. Hence, this stage is also known as slow-wave sleep (SWS). It is very difficult to wake up from this stage; attempts at doing so tend to result in [[Special:MyLanguage/sleep inertia|sleep inertia]] -- a period of intense grogginess and impaired cognitive function. This stage of sleep plays a critical role in the maintenance of the brain through the [[Wikipedia:Glymphatic system|glymphatic system]]. This process takes about 30 to 60 minutes of continuous NREM3 to complete, and could be hindered by schedules containing only short naps.

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