noun Pathology.
a condition characterized by frequent and uncontrollable periods of deep sleep.

1875–80; narco- + (epi)lepsy

narcoleptic, adjective, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
narcolepsy (ˈnɑːkəˌlɛpsɪ)
pathol a rare condition characterized by sudden and uncontrollable episodes of deep sleep

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1880, from Fr. narcolepsie, coined 1880 by Fr. physician Jean-Baptiste-Édouard Gélineau (1859-1928) from comb. form of Gk. narke "numbness, stupor" (see narcotic) + lepsis "an attack, seizure."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

narcolepsy nar·co·lep·sy (när'kə-lěp'sē)
A disorder characterized by sudden and uncontrollable, though often brief, attacks of deep sleep, sometimes accompanied by paralysis and hallucinations. Also called hypnolepsy.

nar'co·lep'tic (-lěp'tĭk) adj. & n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Narcolepsy is considered a primary hypersomnia condition.
So far, the drug is licensed only for the treatment of narcolepsy.
If the cells' activity decreases, narcolepsy or sudden sleepiness, is the
Narcolepsy is a life-long problem, but it is not progressive.
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