Multiple Sleep Latency Testing (MSLT)
The Multiple Sleep Latency Test (MSLT) is performed the day after your overnight sleep study. This test measures how sleepy you are during the day and helps diagnose conditions such as narcolepsy and other sleep disorders.
After you wake up from your overnight sleep study, some of the monitoring sensors will be removed, and you will have time to relax. Your first scheduled nap will begin about 1.5 to 3 hours later.
The MSLT usually includes 4 to 5 short naps throughout the day. Each nap is separated by a 2-hour break.
If your overnight sleep study shows signs of a sleep disorder, the MSLT may be canceled or shortened. Your healthcare provider should receive the results of your sleep studies within two to three weeks.
What to Bring for Your MSLT
Please bring the following items:
- A sleep journal completed for the previous two weeks. Following a regular sleep schedule before the test is important.
- Comfortable, loose-fitting clothes.
- Activities to help pass the time between naps, such as:
- Books
- Magazines
- Laptop or tablet
- Movies
- Crafts or hobbies
- Food will be provided during the test.
- Personal care items, such as:
- Toothbrush and toothpaste
- Lotion
- Other toiletries you may need
Important Information
- Some medications can affect the results of the MSLT. If your doctor or sleep lab has instructed you to stop taking certain medications, be sure to follow those instructions before your test.
- Do not consume caffeine on the day of your MSLT.
- A urine sample will be collected either the morning of the test or the night before your sleep study.