Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
hypnagogic is an adjective meaning "sleep inducing". It carries one recorded sense.
sleep inducing
Definitions, synonyms and semantic relations for hypnagogic come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.