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

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

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World English Dictionary
hypnagogic or hypnogogic (ˌhɪpnəˈɡɒdʒɪk)
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
[C19: from French hypnagogique; see hypno-, -agogic]

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American Heritage
Medical Dictionary

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

  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
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Example sentences
Hypnagogic hallucinations-hallucinations which occur between sleep and wakening.
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