What is cataplexy in the context of narcolepsy?

Cataplexy is a defining symptom of narcolepsy characterized by a sudden loss of muscle tone while the individual remains fully conscious. This is often triggered by strong emotions such as laughter, excitement, or surprise. During an episode, a person may experience weakness in muscle control, leading to slumping or falling, but they do not lose awareness or consciousness. This differentiates cataplexy from other conditions that involve loss of consciousness, such as seizures or fainting, where awareness is impaired. Understanding this symptom is crucial for differentiating narcolepsy from other sleep disorders.