Multiple sleep latency test
A multiple sleep latency test measures how long it takes for you to fall asleep during the day. You may have this test after polysomnography.
For the test, you will be asked to take several naps throughout the day, and a specialist will analyse how quickly and easily you fall asleep.
If you have narcolepsy, you will usually fall asleep easily and enter rapid eye movement (REM) sleep very quickly.