different between hypnagogic vs hypnagogia

English

From French hypnagogique, from Ancient Greek ????? (húpnos, “sleep”) + ?????? (ag?gós, “leading”).

hypnagogic (comparative more hypnagogic, superlative most hypnagogic)

That induces sleep; soporific, somniferous.
That accompanies falling asleep; especially, pertaining to the semi-conscious period immediately preceding sleep.
- 1999, Joyce Crick, translating Sigmund Freud, The Interpretation of Dreams, I.c:
  But if we are in the right mood, a second of such lethargy is enough to make a hypnagogic [transl. hypnagogische] hallucination appear, after which perhaps we reawaken, until the oft-repeated performance is brought to an end by sleep.
- 2001, Joyce Carol Oates, Middle Age: A Romance, Fourth Estate, paperback edition, 253:
  Very quickly it would come to seem to Lionel Hoffmann that the remainder of his life, all that was not Siri, was of little more substance than those hypnagogic images that flash against our eyelids when, in a state of exhaustion, we begin to sink into sleep.

hypnagogia (uncountable)

(medicine) A condition characterized by dreamlike auditory, visual, or tactile sensations when half-awake.

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