The sleep cycle is divided into two main stages: non-rapid eye movement (non-REM) and rapid eye movement (REM).
Non–rapid eye movement sleep has three stages:
Most dreaming happens during REM sleep. During REM sleep:
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 sleep cycle is usually repeated about 4 to 6 times each night.
Current as of:
March 1, 2022
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: March 1, 2022
Author: Healthwise Staff
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.
© 1995-2022 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.