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NREM第一階段佔單相成人總睡眠的5-10%，是所有NREM階段中最淺的睡眠階段。在這個階段中，對外部環境和對自身的意識都會有所減弱。部分人在這個階段會出現抽搐或臨睡幻覺。NREM1中[[Wikipedia:alpha waves|Alpha波]]和[[Wikipedia:theta waves|Theta波]]會混合存在。

NREM第一階段佔單相成人總睡眠的5-10%，是所有NREM階段中最淺的睡眠階段。在這個階段中，對外部環境和對自身的意識都會有所減弱。部分人在這個階段會出現抽搐或臨睡幻覺。NREM1中[[Wikipedia:alpha waves|Alpha波]]和[[Wikipedia:theta waves|Theta波]]會混合存在。

NREM第二階段是比第一階段更深的睡眠，佔總睡眠的45-55%。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 Stage 2, accounting for 45-55% of total sleep, is deeper than the first one. It is more difficult to be awaken from than from the NREM 1.  This stage is characterized by [[Wikipedia:K-complex|K-complexes]] and [[Wikipedia:sleep spindles|sleep spindles]], which are abrupt interruptions in alpha waves activity. This stage of sleep also plays a role in maintaining wakefulness over long periods.

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