Cataplexy is a medical condition that results in sudden muscle weakness or paralysis, often triggered by strong emotions such as laughter, excitement, or anger. Synonyms for cataplexy include collapsing, fainting, passing out, succumbing, prostration, and paralysis. Other related conditions with similar symptoms include narcolepsy, sleep paralysis, and hemiplegic migraine. Cataplexy can be a symptom of narcolepsy, a sleep disorder that causes excessive daytime sleepiness and sleep attacks. Treatment options for cataplexy and narcolepsy include medications, lifestyle changes, and therapy to manage stress and emotions. Seeking medical advice is recommended for anyone experiencing symptoms of cataplexy or other related conditions.