Cataplexy is a sudden, brief loss of muscle tone that usually happens while a person remains conscious. It is strongly associated with type 1 narcolepsy and is often triggered by strong emotion.
Quick answer: what does cataplexy feel like?
Cataplexy can range from subtle weakness to a complete collapse. A person may notice knees buckling, the jaw dropping, the head nodding, slurred speech, facial weakness or loss of strength in the arms. Episodes are usually brief and awareness is typically preserved.
What triggers cataplexy?
Common triggers include laughter, excitement, surprise, anger and other strong emotions. The trigger pattern can vary from one person to another. Some people experience only occasional mild episodes while others have more frequent attacks.
Is cataplexy the same as fainting?
No. In cataplexy, consciousness is generally preserved. This is different from fainting, where consciousness is lost. Cataplexy can also be confused with seizures, drop attacks or other neurological events, so recurrent episodes should be medically assessed.
Why is cataplexy linked to narcolepsy?
Type 1 narcolepsy is associated with loss of hypocretin, also called orexin, a brain chemical involved in wakefulness and REM sleep regulation. Cataplexy is thought to reflect REM-related muscle inhibition intruding into wakefulness.
Read our detailed cataplexy and narcolepsy page for the clinical overview.
Can you have narcolepsy without cataplexy?
Yes. Type 2 narcolepsy generally occurs without cataplexy. This is why the absence of cataplexy does not rule out narcolepsy.
Can cataplexy occur without narcolepsy?
Cataplexy is most strongly associated with narcolepsy type 1, but clinicians still need to consider other explanations for episodes of weakness or collapse. A specialist assessment is important before attaching a diagnosis to any event.
What other symptoms may occur with narcolepsy?
Cataplexy may occur alongside excessive daytime sleepiness, sleep attacks, sleep paralysis, vivid dream-like experiences when falling asleep or waking, and fragmented night-time sleep.
How is cataplexy evaluated?
The clinician asks about what happens before, during and after an episode, including triggers, duration and whether awareness is preserved. If narcolepsy is suspected, the diagnostic pathway may include overnight polysomnography followed by an MSLT.
When should you seek medical advice?
Seek medical advice if you have recurrent unexplained episodes of muscle weakness, especially if they are triggered by emotion or occur together with severe daytime sleepiness. Urgent medical assessment may be appropriate for a first unexplained collapse, injury, loss of consciousness, prolonged weakness or symptoms suggesting another acute neurological problem.
How can cataplexy affect safety?
An episode can increase the risk of falls or injury. If attacks are uncontrolled, discuss driving, heights, machinery and other safety-sensitive activities with your clinician.
Frequently asked questions
How long does cataplexy last?
Episodes are generally brief, often seconds to a few minutes, although individual experiences vary.
Can laughing trigger cataplexy?
Yes. Laughter is a classic trigger, but surprise, excitement, anger and other emotions may also trigger attacks.
Do you lose consciousness during cataplexy?
Typically no. Preserved awareness is one feature that helps distinguish cataplexy from some other causes of collapse.
Medical sources
This article is educational and does not replace a clinical assessment.