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NREM第二階段是比第一階段更深的睡眠，佔總睡眠的45至55%。與NREM1相比，在NREM2中更難被喚醒。這個階段的特徵是[[Wikipedia:K-complex|K-複合波]]和 [[Wikipedia:sleep spindles|睡眠梭狀波]]，即Alpha波活動的突然中斷。這階段的睡眠也負責維持長時間的清醒狀態。  

NREM第二階段是比第一階段更深的睡眠，佔總睡眠的45至55%。與NREM1相比，在NREM2中更難被喚醒。這個階段的特徵是[[Wikipedia:K-complex|K-複合波]]和 [[Wikipedia:sleep spindles|睡眠梭狀波]]，即Alpha波活動的突然中斷。這階段的睡眠也負責維持長時間的清醒狀態。  

NREM第三階段佔總睡眠的15至25%，是所有睡眠階段中最深的階段。這個階段主要包含高振幅和低頻率的[[Wikipedia:delta waves|Delta波]]。因此，它也被稱為慢波睡眠（SWS）。要從這個階段中醒來是非常困難的。試圖這樣做往往會導致一段強烈的呆滯和認知功能受損的時期——[[Special:MyLanguage/sleep inertia|睡眠惰性]]。NREM3通過[[Wikipedia:Glymphatic system|淋巴系統]]在維護大腦方面發揮著關鍵作用。這過程需要約30至60分鐘的連續的NREM3才能完成，因此只包含短暫小睡的時程可能會阻礙到此功能。

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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