While dreaming, your roommate jumps up and thrashes around violently, acting out his dream.Your roommate is suffering from

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REM behavior disorder is a sleep disorder characterized by physical movement and activity during REM sleep, which is the stage of sleep where most dreaming occurs. People with REM behavior disorder may act out their dreams by talking, shouting, punching, kicking, or flailing their arms, often resulting in injury to themselves or others. NREM behavior disorder, on the other hand, involves physical activity during non-REM sleep and is less common. Narcolepsy is a neurological disorder that is characterized by excessive daytime sleepiness, sudden sleep attacks, and episodes of muscle weakness or paralysis, while cataplexy is a sudden loss of muscle tone usually triggered by strong emotions.

While Dreaming, Your Roommate Jumps Up and Thrashes Around Violently