History
The Multiple Sleep Latency Test was created in 1977 by sleep pioneers William C. Dement and Mary Carskadon. It developed out of repeating a project done in 1970 by Dr. Dement called the 90-minute day. They informally called the 0–5 minute range the twilight zone due to its indication of extreme physical and mental impairment.
Read more about this topic: Multiple Sleep Latency Test
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