Hypnagogic adjective

1.of or pertaining to drowsiness.

2.
inducing drowsiness.

Origin:
1885–90;  < French hypnagogique;  see hypn(o)-, -agogue, -ic

Dr John Brydon emailed from Australia: “The sudden jerk that we may make when falling asleep, commonly in the belief we are tumbling out of bed, gives rise to the most delightful name for a medical syndrome that I know: the hypnagogic startle.”

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