hyp·na·gog·ic

[hip-nuh-goj-ik, -goh-jik]
adjective
1.
of or pertaining to drowsiness.
2.
inducing drowsiness.

Origin:
1885–90; < French hypnagogique; see hypn(o)-, -agogue, -ic

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
hypnagogic or hypnogogic (ˌhɪpnəˈɡɒdʒɪk) [Click for IPA pronunciation guide]
 
adj
psychol hypnagogic image See also hypnopompic of or relating to the state just before one is fully asleep
 
[C19: from French hypnagogique; see hypno-, -agogic]
 
hypnogogic or hypnogogic
 
adj
 
[C19: from French hypnagogique; see hypno-, -agogic]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Hypnagogic is always a great word to know.
So is flibbertigibbet. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a chattering or flighty, light-headed person.
American Heritage
Medical Dictionary

hypnagogic hyp·na·gog·ic or hyp·no·gog·ic (hĭp'nə-gŏj'ĭk, -gō'jĭk)
adj.

  1. Inducing sleep; soporific.

  2. Of or relating to the state of drowsiness preceding sleep.

  3. Relating to the images or hallucinations sometimes perceived during this state.

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
Hypnagogic hallucinations-hallucinations which occur between sleep and wakening.
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