Concerning the drowsiness one commonly feels before sleep, the transitional state preceding sleep, and also the hallucinations that may occur at that time. The original French word "hypnagogique" was derived from Greek roots "hypno-", sleep + "agogos", leading = leading to sleep. In the 19th century "hypnagogique" came across the English Channel and became "hypnagogic." A closely allied term is "hypnoidal." It means resembling hypnosis and also refers to the subwaking state, the condition intermediate between sleeping and waking.
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Denoting a transitional state, related to the hypnoidal, preceding sleep; applied also to various hallucinations that may manifest themselves at that time. See hypnoidal. [hypno- + G. agogos, leading]

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hyp·na·go·gic also hyp·no·go·gic .hip-nə-'gäj-ik, -'gō-jik adj of, relating to, or occurring in the period of drowsiness immediately preceding sleep <\hypnagogic hallucinations> compare HYPNOPOMPIC
hyp·na·go·gi·cal·ly -ji-k(ə-)lē adv

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hyp·na·gog·ic (hip″nə-gojґik) 1. hypnotic (defs. 1 and 2). 2. occurring just before sleep; applied to hallucinations occurring at sleep onset.

Medical dictionary. 2011.

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  • Hypnagogic — Hyp na*gog ic, a. [Gr. ? sleep + ? a carrying away.] Leading to sleep; applied to the illusions of one who is half asleep. [1913 Webster] …   The Collaborative International Dictionary of English

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