More commonly refered to as the MSLT
, this tool in the diagnosis of narcolepsy
measures time to sleep onset
after the patient is instructed to fall asleep while lying down in a dark, quiet room.
In practice, unfortunately, there exist some problems with this test. While in my own room, falling asleep is as easy as, well, falling asleep, falling asleep in a sleep clinic with infrared cameras pointed at me, electrodes glued all over my scalp and body, a pulse sensor on my finger, and an CO2 sensor looped under my nose is not. I've done my own version of the MSLT at home, using a video camera and the "sleep latency drop test", where my average sleep latency was about six minutes; my "official" time, as recorded by the Princeton Hospital Sleep Clinic, was nearly twenty.