Sleep Testing



Polysomnography (PSG) is a study of sleep cycles and sleep behavior. It is usually done in a sleep center overnight. This study involves observing a person at sleep while charting brain waves and other bodily functions.

Possible Complications

There are no major, lasting problems with this procedure.



This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

Edits to original content made by Denver Health.

a (Polysomnogram; Overnight Sleep Study; Rapid Eye Movement Studies)


American Academy of Sleep Medicine 

National Sleep Foundation 


Better Sleep Council Canada 

Canadian Sleep Society 


Polysomnography. EBSCO DynaMed Plus website. Available at:  . Updated April 10, 2017. Accessed August 22, 2018.

Sleep studies. Boston Children’s Hospital website. Available at: Accessed August 22, 2018.

Sleep studies. National Heart, Lung, and Blood Institute website. Available at: Accessed August 22, 2018.

Sleep studies: In the sleep laboratory and in the home. American Thoracic Society website. Available at: Updated 2015. Accessed August 22, 2018.