SUNY Downstate Medical Center
Sleep Disorders Center
Sleep Studies Menu
Multiple Sleep Latency Test (MSLT)
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.