Epidemiology

Narcolepsy is not a rare condition; the estimated prevalence in western Europe and in the US is between 0.2 and 2 per 1000 people.[7][8][9] It is the second most common cause of disabling daytime sleepiness after obstructive sleep apnoea.[10] Approximately 125,000 people in the US have narcolepsy.[3] Narcolepsy affects both sexes, with a slight male preponderance.[9][11]

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