Cataplexy (attacks of sudden weakness)
Cataplexy [5] is an attack of sudden weakness against a background of strong positive or negative emotions (laughter, surprise, intercourse, crying, and anger). Weakness is caused by a sharp loss of muscle tone. A person’s muscles suddenly relax, due to which the lower jaw hangs, knees buckle, and he/she speaks indistinctly. The attack can develop so quickly that in some cases, the patient may fall and be injured. The duration of an attack ranges from a few seconds to several minutes. This may be followed by falling asleep. This phenomenon is less common in narcolepsy caused by brain tumors