Polysomnography

Polysomnography

Polysomnography (PSG) is a study or test done while you’re fully asleep. A doctor will observe you as you sleep, record data about your sleep patterns, and may identify any sleep disorders.

Why do I need a polysomnography?

A doctor can use a polysomnography to diagnose sleep disorders.

It often evaluates for symptoms of sleep apnea, a disorder in which breathing constantly stops and restarts during sleep. The symptoms of sleep apnea include:

• sleepiness during the day despite having rested
• ongoing and loud snoring
• periods of holding your breath during sleep, which are followed by gasps for air
• frequent episodes of waking up during the night
• restless sleep

Polysomnography can also help your doctor diagnose the following sleep disorders:

• narcolepsy, which involves extreme drowsiness and “sleep attacks” during the day
• sleep-related seizure disorders
• periodic limb movement disorder or restless legs syndrome, which involves uncontrolled flexing and extension of the legs while asleep
• REM sleep behavior disorder, which involves acting out dreams while asleep
• chronic insomnia, which involves having difficulty falling asleep or remaining asleep

What happens after a polysomnography?

If you receive a sleep apnea diagnosis, your doctor may recommend that you use a continuous positive airway pressure (CPAP) machine.

This machine will provide a constant air supply to your nose or mouth while you sleep. A follow-up polysomnography may determine the right CPAP setting for you.

If you receive a diagnosis of another sleep disorder, your doctor will discuss your treatment options with you.