hypnagogic adj 1: sleep inducing [syn: {soporific}, {soporiferous}, {somniferous}, {somnific}, {hypnogogic}, {hypnagogic}]
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]