Multiple Sleep Latency Test

The multiple sleep latency test (MSLT) is ordered to test for narcolepsy. An MSLT is a daytime study, which follows your overnight diagnostic sleep study. In the morning, some of the leads and belts are removed.

During the MSLT, you have a series of five napping opportunities throughout the day. Your physician is interested in three things:

• if you go to sleep at every napping opportunity
• how quickly you go to sleep
• if you go into a deep, restorative rapid-eye-movement (REM) sleep