Narcolepsy is a neurological condition most characterized by Excessive Daytime Sleepiness (EDS), in which a person falls asleep during the day at inappropriate times, such as at work or school. A narcoleptic will most probably experience disturbed nocturnal sleep, which is often confused with insomnia, and disorder of REM or rapid eye movement sleep. It is one of the dyssomnias. A narcoleptic may also fall asleep at random.
Narcolepsy is characterised by sudden and uncontrollable attacks of sleep at irregular and unexpected times. Attacks may occur in the middle of a conversation or during a meal and can last minutes or hours.
http://www.bbc.co.uk/health/conditions/narcolepsy1.shtml
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