The absence of muscle tone is closely related to such symptoms as fatigue and excessive daytime sleepiness. Medical professionals also call this phenomenon a cataplexy. The person under the risk of narcolepsy may notice significant physical changes. Greased communication along with the full body weakness are both outcomes of weak muscle tone.

Such symptoms take from several seconds to several minutes. One cannot manage own speech or actions during these periods of time. The patient also demonstrates specific emotions during these attacks, almost always positive (laughing out loud or joy). In separate cases, the patients may demonstrate rage, surprise, or terrifying. Be ready that the head of such person may hang without being managed or his/her knees would buckle.