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Multiple Latency Test


A multiple sleep latency test (MSLT) involves charting how quickly you fall asleep during quiet daytime situations. It also measures how fast you enter the stage of REM sleep.

What to Expect

A multiple sleep latency test is given during the daytime. The MSLT test usually follows an all-night sleep study. The MSLT test consists of a series of 20-minute naps, during which the patient tries to fall asleep. The test is given every two hours throughout the day, with each nap lasting about 20 minutes. During each nap, sensors and electrodes record data on body functions (heartbeat, breathing, eye movement, etc.).

If you are scheduled for an MSLT test following your all-night sleep study, please bring something to read, work on or watch during the day to help keep you occupied between naps. In order for the testing to be accurate, patients must remain awake between naps. A TV and VCR are provided in each room. Please feel free to bring in your own videos to watch in-between naps. The MSLT testing is usually completed between 8:00am and 6:00 p.m. on the day following the all-night sleep study.

Why It Is Done

MSLT is mainly used to find out if someone has narcolepsy.
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