First Time User? Sign Up Now
First Time User? Enroll now.
Home > Health Library > Stages of Sleep
Sleep stages are divided into non–rapid eye movement (non-REM) and rapid eye movement (REM).
Non–rapid eye movement (NREM) sleep has 3 stages:
Rapid eye movement sleep is deeper than non-REM sleep. During REM sleep:
You do most of your dreaming during REM sleep. But your brain paralyzes your muscles so you do not act out the dreams.
During sleep, a person usually progresses through the 3 stages of non-REM sleep before entering REM sleep. This takes about 1 to 2 hours after falling asleep. The cycle is repeated three to four times each night. An adult spends more time in NREM sleep than in REM sleep. An infant usually spends about half of the sleeping time in NREM and half in REM stages.
Current as of: June 9, 2019
Author: Healthwise StaffMedical Review: Anne C. Poinier MD - Internal MedicineAdam Husney MD - Family MedicineHasmeena Kathuria MD - Pulmonology, Critical Care Medicine, Sleep Medicine
Current as of:
June 9, 2019
Medical Review:Anne C. Poinier MD - Internal Medicine & Adam Husney MD - Family Medicine & Hasmeena Kathuria MD - Pulmonology, Critical Care Medicine, Sleep Medicine
To learn more about Healthwise, visit Healthwise.org.
© 1995-2019 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
UNC Medical Center
101 Manning Drive
Chapel Hill, NC 27514
UNC Health Care Citrix
UNC Medical Center Intranet
Copyright 2019 UNC Health Care. All rights reserved.