Main Entry: hyp·na·go·gic Variant: alsohyp·no·go·gic/"hip-n&-'gäj-ik, -'gO-jik/ Function:adjective : of, relating to, or associated with the drowsiness preceding sleep <hypnagogic hallucinations> —compare HYPNOPOMPIC —hyp·na·go·gi·cal·ly/-ji-k(&-)lE/adverb