Multiple Sleep Latency Test (MSLT)

Multiple Sleep Latency Test (MSLT)

Is a daytime study, which involves a series of naps. This study assesses daytime sleepiness. A physician may order a MSLT to follow a PSG nighttime study. The diagnostic equipment used for a MSLT is less extensive than the nighttime study. The MSLT will last most of the day. Over the course of the day, you will take five scheduled naps. Each of these nap trials is separated by a two-hour break. Depending on the results, a shorter four-nap study may also be used. Be prepared to stay for the full five-nap version of the study. There will be a urine test at the beginning of the study and your body must be free of any depressants and stimulants. Please talk with your doctor about which medications that you should discontinue prior to your appointment.