Assertion: narcolepsy's cataplexy | /r/HasProperty | prominent sign of narcolepsy
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text: In fact, Cataplexy, which is termed as the muscle paralysis of Rapid Eye Moving sleep (REM) occurring when a person is awake, is a prominent sign of narcolepsy; this can result in sudden loss of muscle tone, giving rise to slack jaw or weakness of arms, legs, or trunk.