Pronounced: Pol-ee-som-NAH-grah-feeEn Español (Spanish Version)
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.
Last reviewedAugust 2013by Rimas Lukas, MD; Michael Woods, MD
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