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.
Grinnell, R. (2008). Cataplexy. Psych Central. Retrieved on November 24, 2015, from http://psychcentral.com/encyclopedia/2008/cataplexy/