adjective
or hyp·no·gog·ic |hipnə|gäjik
Etymology: hypnagogic from French hypnagogique, from hypn- + -agogique (from Greek -agōgikos as in paidagōgikos pedagogic); hypnogogic, alteration of hypnagogic
: of, relating to, or associated with the drowsiness preceding sleep
hypnagogic hallucinations
— opposed to hypnopompic