![]() ![]() They often experience vivid hallucinations while falling asleep (hypnogogic hallucinations) or while waking up (hypnopompic hallucinations). ![]() Most affected individuals have trouble sleeping for more than a few hours at night. However, some do not, which has led researchers to distinguish two major forms of the condition: narcolepsy with cataplexy and narcolepsy without cataplexy. Most people diagnosed with narcolepsy also have cataplexy. Episodes of cataplexy usually last just a few seconds, and they may occur from several times a day to a few times a year. These episodes of muscle weakness can cause an affected person to slump over or fall, which occasionally leads to injury. They last from a few seconds to a few minutes and often lead to a longer nap, after which affected individuals wake up feeling refreshed.Īnother common feature of narcolepsy is cataplexy, which is a sudden loss of muscle tone in response to strong emotion (such as laughing, surprise, or anger). "Sleep attacks" can occur at unusual times, such as during a meal or in the middle of a conversation. Affected individuals feel tired during the day, and several times a day they may experience an overwhelming urge to sleep. Narcolepsy is characterized by excessive daytime sleepiness. ![]() Although this condition can appear at any age, it most often begins in adolescence. Narcolepsy is a chronic sleep disorder that disrupts the normal sleep-wake cycle. ![]()
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