Polysomnography (Sleep Study)

Polysomnography is an overnight sleep study that records brain waves, breathing patterns, oxygen levels, heart rhythm, and body movements. It is used to diagnose sleep disorders such as obstructive sleep apnea, narcolepsy, restless legs syndrome, and chronic insomnia.

• Avoid caffeine and alcohol on the day of the study.
• Bring comfortable sleepwear and personal items.
• Wash hair and skin to remove oils or lotions that interfere with sensors.

You will spend the night in a sleep lab or hospital setting. Sensors are placed on your scalp, chest, arms, and legs to monitor physiologic activity while you sleep. A technologist observes and records data. The test is painless, though some patients find it harder to fall asleep in a lab setting.

• Polysomnography is noninvasive and very safe.
• Some patients may experience mild skin irritation from electrodes.

A sleep specialist reviews the data to identify abnormal breathing events, sleep stages, and other disruptions. Results guide treatment such as CPAP therapy, medications, or behavioral interventions.