Definition of hypnagogic

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< hypn-

hypno- >

hyp·na·gog·ic also hyp·no·gog·ic    (hpn-gjk, -gjk) KEY 

ADJECTIVE:

1. Inducing sleep; soporific.
2. Of, relating to, or occurring in the state of intermediate consciousness preceding sleep: hypnagogic hallucinations.

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ETYMOLOGY:
French hypnagogique : Greek hupnos, sleep ; see hypno- + Greek aggos, leading (from agein, to lead; see ag- in Indo-European roots)