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Multiple
Sleep Latency Test
A
Multiple Sleep Latency Test (MSLT) is conducted, along with a
polysomnogram, to confirm or rule out narcolepsy. It is a test
done during the daytime that monitors a series of naps to reveal a
person’s severity of sleepiness and whether REM sleep (deep
sleep during which a person dreams) intrudes inappropriately
throughout waking hours.
The test is usually done immediately after an overnight study. The
patient will remain wired with most of the wires from the
polysomnogram done the night before. A series of five naps are
taken at 2-hour intervals. The test is usually done by 5 p.m.
There is little or no discomfort from the MSLT.
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