hypnagogic startle

hypnagogic startle

Sleep start Sleep disorders A sudden body jerk, observed normally at sleep onset and resulting in momentary awakening
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

hyp·na·gog·ic star·tle

(hip'nă-goj'ik stahr'tĕl)
A twitch or myoclonus that occurs when the sleeper awakes suddenly, often accompanied by a sensation of falling through space.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012