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SUNY Downstate Medical Center

Sleep Disorders Center

Multiple Sleep Latency Test (MSLT)

photo of 3 people sitting in front of monitors

MSLT, also called a "nap study", is used to see how quickly a person falls asleep during the day. The MSLT is the standard way to measure the level of daytime sleepiness. A patient's brain waves, heartbeat, eye and chin movements are recorded. This study also measures how quickly and how often one enters the rapid-eye-movement (REM) stage of sleep.