Multiple Sleep Latency Testing

The multiple sleep latency test (MSLT) tests for excessive daytime sleepiness by measuring how quickly you fall asleep in a quiet environment during the day. Also known as a daytime nap study, the MSLT is the standard tool used to diagnose narcolepsy and idiopathic hypersomnia.

The MSLT is a full-day test that consists of five scheduled naps separated by two-hour breaks. During each nap trial, you will lie quietly in bed and try to go to sleep. Once the lights go off, the test will measure how long it takes for you to fall asleep. You will be awakened after sleeping 15 minutes. If you do not fall asleep within 20 minutes, the nap trial will end.

Each nap will be taken in a dark and quiet sleep environment that is intended for your comfort and to isolate any external factors that may affect your ability to fall asleep. A series of sensors will measure whether you are asleep. The sensors also determine your sleep stage.

The MSLT will be preceded by an overnight sleep study in the facility. This is to ensure that the previous night’s sleep was adequate and not disrupted by another sleeping disorder or other external factors. The test will be looking for excessive daytime sleepiness. Excessive daytime sleepiness occurs when you are sleepy when you should be awake and alert. Our board-certified sleep medicine physicians will recommend an MSLT if they suspect you have excessive daytime sleepiness related to narcolepsy or hypersomnia.