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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.
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. 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 K-complexes and sleep spindles , which are abrupt interruptions in alpha waves activity. This stage of sleep also plays a role in maintaining wakefulness over long periods.
