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Abrupt loss of postural control after experiencing a strong emotion, without decreased consciousness. Often affects narcoleptics.

Example: A woman begins to laugh at a joke, then abruptly crumples to the floor. She’s alert and very embarrassed about this lapse.

APA Reference
Grinnell, R. (2018). Cataplexy. Psych Central. Retrieved on June 19, 2018, from https://psychcentral.com/encyclopedia/cataplexy/