Webster's Revised Unabridged Dictionary · 1913

Hypnogenic

Hypnogenic , adjective

[Greek {not transcribed} sleep + root of gi`gnesqai to be born.]

(Physiology) Relating to the production of hypnotic sleep; as, the so-called hypnogenic pressure points, pressure upon which is said to cause an attack of hypnotic sleep. — De Watteville