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SUNY Downstate Sleep Disorders Center

Nocturnal Polysomnography(NPSG)

polysomnography tracing

Polysomnography is an overnight test that measures multiple variables during sleep, including the patient's airflow through the nose and mouth, blood pressure, electrocardiographic activity, blood oxygen level, brain wave patterns, eye movement, and the movement of respiratory muscle and limbs. We also observe various sleep stages and body positions of the patient throughout the night.