MSLT is a nap study to see how quickly you fall asleep in quiet circumstances during the day. Sleepiness at a time and place where you should be awake and alert is considered extreme drowsiness.
The test charts your brain activity and records movements of the eyes and chin. MSLT also measures how quickly and often a patient enters the REM sleep stage. The idea of this study is that the subject should fall asleep in a shorter amount of time as their feeling of sleepiness increases.
Breakfast and lunch are served during this test.