narcolepsy
noun/ˈnɑːkəʊlepsi/
/ˈnɑːrkəʊlepsi/
[uncountable] (medical)- a condition in which somebody falls into a deep sleep when they are in a relaxing environmentWord Originlate 19th cent.: from Greek narkē ‘numbness’, on the pattern of epilepsy.
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narcolepsy