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Sleep Disorder Information :: Narcolepsy Narcolepsy is a rare disorder, affecting about 120,000 people in the United States . It causes sufferers to uncontrollably fall asleep, even in the most unlikely situations, such as in the middle of a meal or conversation. In some people with narcolepsy, the condition can also cause a sudden loss of muscle control and weakness, known as cataplexy, which is usually triggered by emotions such as amusement, anger, or excitement.
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