Home > Patients & Visitors > 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
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.
ByHealthwise StaffPrimary Medical ReviewerAnne C. Poinier, MD - Internal MedicineAdam Husney, MD - Family MedicineSpecialist Medical ReviewerMark A. Rasmus, MD - Pulmonology, Critical Care Medicine, Sleep Medicine
Current as ofMay 23, 2016
Current as of:
May 23, 2016
Anne C. Poinier, MD - Internal Medicine & Adam Husney, MD - Family Medicine & Mark A. Rasmus, MD - Pulmonology, Critical Care Medicine, Sleep Medicine
To learn more about Healthwise, visit Healthwise.org.
© 1995-2016 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
Our interactive Decision Points guide you through making key health decisions by combining medical information with your personal information.
You'll find Decision Points to help you answer questions about:
Get started learning more about your health!
Our Interactive Tools can help you make smart decisions for a healthier life. You'll find personal calculators and tools for health and fitness, lifestyle checkups and pregnancy.
Feeling under the weather?
Use our interactive symptom checker to evaluate your symptoms and determine appropriate action or treatment.