Polysomnography
Alternate Names : Sleep study, Polysomnogram, Rapid eye movement studies
Definition
Polysomnography is a sleep study. A sleep study monitors you as you sleep, or try to sleep. There are two states of sleep: - Rapid eye movement (REM) sleep
- Non-rapid eye movement (NREM) sleep
REM sleep is associated with dreaming. Your body muscles (except your eyes and lungs) do not move during this stage of sleep. NREM sleep has four stages that can be detected by EEG waves. REM sleep alternates with NREM sleep approximately 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 the following information: - Blood oxygen levels
- Body position
- Brain waves (EEG)
- Breathing rate
- Electrical activity of muscles
- Eye movement
- Heart rate
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