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Cataplexy is a sudden lack of muscle tone or muscle weakness, sometimes resulting in the complete paralysis of voluntary muscles. This condition is a common symptom of narcolepsy, analogous to the muscle atonia experienced during REM sleep. However, the presentation of cataplexy can vary among individuals; for instance, in some unusual cases, the weakness may be confined to only one side of the body.

Cataplexy

An individual is at a party, laughing hysterically at a friend's joke. Suddenly, their knees give way and they slump into a chair, fully awake and aware but temporarily unable to move their arms or legs. This sudden loss of muscle tone triggered by strong emotion is best identified as which of the following?

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