Multiple Sleep Latency Test (MSLT)

A Multiple Sleep Latency Test (MSLT) is a test to confirm, or rule out the presence of Narcolepsy. This is a series of 5 naps at certain intervals throughout the daytime following a Polysomnogram (PSG). The PSG is performed to monitor the efficiency and quality of sleep preceding this procedure. The 5 naps are performed throughout the day at 2 hours intervals. The naps generally last between 20-35 minutes. The sleep latency and REM onset are measured for all 5 nap. A blood/urine test for stimulants may be necessary. Please bring your own medications and food. A refrigerator and microwave are available.


The MSLT study usually follows the overnight PSG study. This daytime study takes up to additional 8 - 10 hours. Thus your stay in the sleep center for the combined PSG and MSLT may last up to 21 hours. You will have to bring your own supply of medication and food. A refrigerator and microwave are available.