narcolepsyEnglishOxford New American Dictionarynarcolepsy /ˈnärkəˌlepsē, ˈnɑrkəˌlɛpsi / ▸ noun Medicine a condition characterized by an extreme tendency to fall asleep whenever in relaxing surroundings. – ORIGIN late 19th century : from Greek narkē ‘numbness’, on the pattern of epilepsy.