Polysomnography is a sleep study. This test records certain body functions as you as you sleep, or try to sleep. Polysomnography is used to diagnose sleep disorders.
There are two states of sleep:
REM sleep alternates with NREM sleep about every 90 minutes. A person with normal sleep usually has four to five cycles of REM and NREM sleep during a night.
A sleep study measures your sleep cycles and stages by recording:
Polysomnography can be done either at a sleep center or in your home.
AT A SLEEP CENTER
Full sleep studies are usually done at a special sleep center.
You may be able to use a sleep study device in your home instead of at a sleep center to help diagnose sleep apnea. You either pick up the device at a sleep center or a trained therapist comes to your home to set it up.
Home testing may be used when:
Whether the test is at a sleep study center or at home, you prepare the same way. Unless directed to do so by your doctor, do not take any sleep medicine and do not drink alcohol or caffeinated beverages before the test. They can interfere with your sleep.
Polysomnography can also diagnose other sleep disorders:
A sleep study tracks:
Most people have short periods during sleep where their breathing stops or is partly blocked. The Apnea-Hypopnea Index (AHI) is the number of apnea or hypopnea measured during a sleep study. AHI results are used to diagnose obstructive sleep apnea.
Normal test result show:
Test results above 5 may mean you have sleep apnea:
To make a diagnosis and decide on treatment, the sleep specialist must also look at:
Sleep study; Polysomnogram; Rapid eye movement studies; Split night polysomnography; PSG
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Updated by: Allen J. Blaivas, DO, Clinical Assistant Professor of Medicine UMDNJ-NJMS, Attending Physician in the Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Veteran Affairs, VA New Jersey Health Care System, East Orange, NJ. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
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