What is the normal sleep pattern in adults?

Updated: Nov 05, 2019
  • Author: Pradeep C Bollu, MD; Chief Editor: Selim R Benbadis, MD  more...
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Stage N1 is considered a transition between wake and sleep. It occurs upon falling asleep and during brief arousal periods within sleep and usually accounts for 2–5% of total sleep time. Stage N2 occurs throughout the sleep period and represents 45–55% of total sleep time. Stage N3 (slow-wave sleep) occurs mostly in the first third of the night and constitutes 10–20% of total sleep time. REM represents 20–25% of total sleep time and occurs in 4–5 episodes throughout the night. [2]

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