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Sleep apnea or another sleep-related breathing disorder.

Your health care provider may recommend a sleep study if it's suspected that you have: But sleep disorders can interfere with this sleep process. You cycle between NREM and REM sleep in about 90 minutes. You typically go through multiple sleep cycles a night. Most dreaming occurs during this stage of sleep. Your eyes quickly move back and forth during REM sleep. This sleep stage is called rapid eye movement (REM) sleep.

This is recorded during a sleep study with a test called an electroencephalogram (EEG).Īfter an hour or two of NREM sleep, brain activity picks up again. During this stage, brain waves slow down. The typical process of falling asleep begins with a sleep stage called non-rapid eye movement (NREM) sleep. It can identify if or when your sleep patterns are disrupted and why.

Polysomnography monitors your sleep stages and cycles.