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Epidemiology

Isolated sleep paralysis is commonly seen in patients that have been diagnosed with narcolepsy. Approximately 30–50% of people that have been diagnosed with narcolepsy, have experienced sleep paralysis as an auxiliary symptom. A majority of the individuals who have experienced sleep paralysis, have sporadic episodes that occur once a month to once a year. Only 3% of individuals who experience sleep paralysis that is not associated with a neuromuscular disorder have nightly episodes.