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. It is the second most common cause of disabling daytime sleepiness after obstructive sleep apnoea. Approximately 125,000 people in the US have narcolepsy. Narcolepsy affects both sexes, with a slight male preponderance.
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