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Polysomnogram (PSG)

A polysomnogram is an all-night diagnostic test used to evaluate for possible sleep disorders such as insomnia, hypersomnia, excessive daytime sleepiness, obstructive sleep apnea, narcolepsy, breathing difficulties or behavior disturbances during sleep, or other sleep disorders.

A polysomnogram is a test of sleep cycles through continuous recordings of brain waves (EEG), electrical activity of muscles, eye movement (electrooculogram), breathing rate, blood pressure, blood oxygen saturations, heart rhythm, and direct observations of the person during sleep to uncover the source of sleep problems. 

Polysomnograms are conducted in the Sleep Lab during the night, so normal sleep patterns can be reproduced. Electrodes are placed on the chin, scalp, and outer edge of the eyelids in preparation for the test. Characteristic patterns from the electrodes are recorded while you are awake and during sleep. The time taken to fall asleep as well as time to enter REM sleep is measured. Patients are monitored and recorded by a video camera during testing.

Test results are reviewed and a report will be sent to the ordering physician with recommendations for treatment and follow-up. Treatment may include lifestyle changes, breathing aid devices, and medications.

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