Cataplexy Associated with Narcolepsy
Cataplexy is a sudden brief loss of muscle tone, often triggered by laughter, surprise or anger, while consciousness is usually preserved.
Key points
- Episodes range from jaw or knee weakness to complete collapse and typically resolve within seconds or minutes.
- Preserved awareness and emotional triggers help distinguish cataplexy from many seizures and fainting episodes.
- Treatment addresses both attack frequency and the wider narcolepsy pattern, including daytime sleepiness and disrupted night sleep.
The listings below do not confirm cataplexy; a sleep specialist should exclude seizure, syncope and other causes of collapse.
Establishing narcolepsy
History includes daytime sleep attacks, sleep paralysis, dream-like experiences around sleep and attack videos or witness accounts. Overnight polysomnography followed by a multiple sleep latency test may support narcolepsy. Medicine and sleep deprivation can distort testing and need planned management.
Reducing attacks and injury
Regular sleep scheduling and planning around high-risk activities are important. Medicines that suppress REM-related cataplexy or improve narcolepsy symptoms have distinct sedating, cardiovascular and interaction risks. Driving and work safety require individual advice based on symptom control.
When to seek urgent care
Seek urgent assessment for a first unexplained collapse, injury during an episode, prolonged unresponsiveness, seizure-like movements with confusion afterwards, chest pain or new weakness that does not resolve.