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SYMPTOMS

The main symptoms of narcolepsy are excessive daytime sleepiness and abnormal REM sleep: Narcolepsy is not only a serious and common medical problem, it also offers basic sleep researchers a unique opportunity to gather new information on the central mechanisms regulating REM sleep and alertness. Since the 1960s it has been known that several of the disabling symptoms of narcolepsy, such as sleep paralysis, cataplexy and hypnagogic hallucinations, are pathological equivalents of REM sleep. In sleep paralysis, a frightening symptom considered to be an abnormal episode of REM sleep atonia, the patient suddenly finds himself unable to move for a few minutes, most often upon falling asleep or waking up. During hypnagogic hallucinations, patients experience dream-like auditory or visual hallucinations, while dozing or falling asleep. Cataplexy, a pathological equivalent of REM sleep atonia unique to narcolepsy, is a striking, sudden episode of muscle weakness triggered by emotions. Typically, the patient's knees buckle and may give way upon laughing, elation, surprise or anger. In other typical cataplectic attacks the head may drop or the jaw may become slack. In severe cases, the patient might fall down and become completely paralyzed for a few seconds to several minutes. Reflexes are abolished during the attack.