Excessive daytime sleepiness occurs as the result of poor nocturnal sleep and spontaneous entry into a sleep cycle during the day, with or without warning.  An individual may "nod off" multiple times during the day.  At other times. the individual may only stare off into space in a dream-like state.  Narcolepsy patients also exhibit automatic behavior in which they often perform repetitive tasks without remembering that they have done so.

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