A brain disorder that is a common symptom of narcolepsy that can cause weakness or lack of muscle control.

Most attacks are brought on by strong or extreme emotional feelings, such as: Anger, stress, anxiety, depressed mood, or even joy.

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Symptoms include reduced levels of hypocretin in the brain, drooping eyelids, inability to stand or move, loss of muscle tone, causing weakness or full paralysis, while remaining awake.