The Multiple Sleep Latency Test measures brain waves (EEG), eye movements (EOG) and muscle activity from the chin to determine sleep latency and sleep stage during naps.

What to Expect

Plan to spend the entire day. The Multiple Sleep Latency Test consists of four naps, beginning at two-hour intervals. You may sleep for only 15 minutes if you fall asleep. If you do not fall asleep, the nap will last 20 minutes. The hospital food service provides a lunch.

What to do prior to the Multiple Sleep Latency Test

  • Avoid caffeine on the day of the test.
  • Try to have a normal night of sleep on the night before the test.   Your insurance may require polysomnography the night before your MSLT.
  • Bring any medications that you usually take during the day.