Cataplexy is a sudden loss of muscle tone that can occur in people with narcolepsy. It often happens in response to strong emotions, such as laughter, excitement, or anger. During an episode, a person may experience weakness in their limbs or even collapse, but they remain fully aware of their surroundings. The duration of cataplexy can vary from a few seconds to a couple of minutes. While it can be alarming, it is not life-threatening. Treatment options, including medications and lifestyle changes, can help manage the frequency and severity of cataplexy episodes.