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Four other classic symptoms of narcolepsy, which may not occur in all patients, are cataplexy, sleep paralysis, hypnogogic hallucinations, and automatic behavior. Cataplexy is an episodic condition featuring loss of muscle function, ranging from slight weakness (such as limpness at the neck or knees, sagging facial muscles, or inability to speak clearly) to complete body collapse. Episodes may be triggered by sudden emotional reactions such as laughter, anger, surprise, or fear, and may last from a few seconds to several minutes. The person remains conscious throughout the episode. Sleep paralysis is the temporary inability to talk or move when waking up. It may last a few seconds to minutes. This is often frightening but is not dangerous. Hypnagogic hallucinations are vivid, often frightening, dreamlike experiences that occur while dozing, falling asleep and/or while awakening. Automatic behavior means that a person continues to function (talking, putting things away, etc.) during sleep episodes, but awakens with no memory of performing such activities.
Nighttime sleep does not include much deep sleep, so the brain tries to "catch up" during the day, hence EDS (Excessive Daytime Sleepiness)
May visibly fall asleep at any moment (such motions as head bobbing are common)
People with narcolepsy fall quickly into what appears to be very deep sleep
They wake up suddenly and can be disoriented when they do (dizziness is a common occurrence)
They have very vivid dreams, which they often remember
People with narcolepsy may dream even when they only fall asleep for a few seconds.