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The Cause of Narcolepsy with and without Cataplexy

In most cases of narcolepsy with cataplexy (and in rare cases without cataplexy), all the symptoms are caused by the loss of approximately 70,000 brain cells producing a chemical called hypocretin, a finding made at Stanford University. Visit the for more details.

In most cases of narcolepsy without cataplexy (and in rare cases with cataplexy), the cause of the symptoms is unclear and the diagnostic is purely based on the result of an abnormal sleep test called the multiple sleep latency test (MSLT).