Assertion: narcolepsy's cataplexy | /r/CapableOf | affect approximately 70% of people
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text: Cataplexy affects approximately 70% of people who have narcolepsy, and is caused by an autoimmune destruction of hypothalamic neurons that produce the neuropeptide hypocretin (also called orexin), which regulates arousal and has a role in stabilization of the transition between wake and sleep states.