Cataplexy refers to a muscle weakness or paralysis.  It is a symptom of Narcolepsy. It is often triggered by strong emotion.

Other /More definition:
Cataplexy refer to episodes of sudden loss of muscle tone lasting from a few seconds to minutes; sudden temporary paralysis of the muscles; attack of muscle weakness while a person remains awake Cataplexy means stupor or motor immobility.

List of books: Cataplexy

Other /More definition:
Cataplexy refers to a sudden, temporary loss of muscle control in a person with Narcolepsy. An attack of Cataplexy usually is triggered by strong emotional reactions such as laughter, excitement, surprise, or anger. Factors that contribute to the attacks of Cataplexy include physical fatigue, stress, and sleepiness.

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