MSLT

Carolyn Fay
2007 Oct 15

The Multiple Sleep Latency Test, devised by Dement and his team at the Stanford Sleep Center, measures how long it takes a subject to fall asleep.  The test is limited to 20 minutes, and is administered every 2 hours during the daytime.  The MSLT is useful in charting sleep debt and its interaction with the biological clock. 

Source:

Dement, The Promise of Sleep