________ is characterized by episodes of sudden loss of muscle tone, lasting under two minutes.

A) Hypersomnia
B) Somnambulism
C) Cataplexy
D) Insomnia

Cataplexy is a symptom of narcolepsy and is characterized by sudden episodes of muscle weakness or paralysis that can last for a few seconds up to two minutes. It is usually triggered by strong emotions such as laughter, surprise, or anger. Hypersomnia refers to excessive daytime sleepiness, somnambulism is sleepwalking, and insomnia is difficulty falling or staying asleep.