By Sarah Fielding December 07, 2021
The following day, a multiple sleep latency test (MSLT) monitors people as they take naps. It records how long a person takes to fall asleep and when they enter REM sleep, says Alex Dimitriu, MD, double board-certified in psychiatry and sleep medicine and founder of Menlo Park Psychiatry & Sleep Medicine. Doctors can also use hypocretin-1 levels to help confirm narcolepsy by “measuring levels of hypocretin or orexin in the cerebrospinal fluid. This is often done using a spinal tap,” Dr. Dimitriu tells Health. Hypocretin levels of less than 110 picrograms per milliliter “are often diagnostic of” narcolepsy type 1, he adds.
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