Multiple Sleep Latency Test

Multiple Sleep Latency Test

The Multiple Sleep Latency Test (MSLT) determines how sleepy you are by measuring how long it takes you to fall asleep and it also measures the type of sleep that you get as well. This test is performed after a full night Polysomnogram and is performed during the day. During this test, you will take four or five 20-minute nap trials scheduled about two hours apart. Between the naps, you must try to stay awake. During this test, just like the Polysomnogram and the CPAP Titration, numerous body functions will be monitored. The most common reason for this procedure is to help rule a suspicion of Narcolepsy and/or the presence of significant hypersomnolence during the day. Falling asleep within 5-10 minutes for the naps may indicate clinically significant hypersomnolence and the presence of REM sleep during 2 of the nap trials may suggest Narcolepsy since REM sleep is generally only seen after 90-120 minutes of sleep, not 20 minutes.