What causes cataplexy and how can one treat it?

Cataplexy is one of the symptoms that can happen in people with narcolepsy. A person with cataplexy may suddenly lose muscle tone while awake, causing the head to fall forward and the knees to buckle. Most attacks last for less than 30 seconds and may go unnoticed, but in severe cases, the person may fall and stay paralyzed for as long as several minutes. Laughter, anger, or other strong emotions often trigger cataplexy. Medication is often needed to help treat the condition.