Definify.com

Webster 1913 Edition

Adj.

[Gr. [GREEK] sleep + root of

γίγνεσθαι

to be born.]

(Physiol.)

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.

hypnogenic ‎(not comparable)

Producing hypnotic sleep.
- 1887, The Popular Science Monthly
  In order to illustrate further the intimate connection between certain morbid forms of sleep and the hysterical state, I shall briefly allude to the so-called "hysterogenic" and "hypnogenic" pressure-points […]