EDS is characterized by persistent sleepiness, regardless of how much sleep an individual gets at night. Excessive daytime sleepiness (EDS)-All individuals with narcolepsy have EDS, and it is often the most obvious symptom.Symptoms can partially improve over time, but they will never disappear completely. Narcolepsy is a lifelong problem, but it does not usually worsen as the person ages. If left undiagnosed or untreated, narcolepsy can interfere with psychological, social, and cognitive function and development and can inhibit academic, work, and social activities. This helps explain some symptoms of narcolepsy. Also, the muscle weakness or dream activity of REM sleep can occur during wakefulness or be absent during sleep.
People with narcolepsy frequently enter REM sleep rapidly, within 15 minutes of falling asleep. Dreams occur during REM sleep, and the brain keeps muscles limp during this sleep stage, which prevents people from acting out their dreams. In a normal sleep cycle, a person enters rapid eye movement (REM) sleep after about 60 to 90 minutes. Other symptoms may include sudden muscle weakness while awake that makes a person go limp or unable to move (cataplexy), vivid dream-like images or hallucinations, and total paralysis just before falling asleep or just after waking up (sleep paralysis). People may unwillingly fall asleep even if they are in the middle of an activity like driving, eating, or talking. Narcolepsy can greatly affect daily activities. Many individuals with narcolepsy also experience uneven and interrupted sleep that can involve waking up frequently during the night. People with narcolepsy may feel rested after waking, but then feel very sleepy throughout much of the day. Narcolepsy is a chronic neurological disorder that affects the brain's ability to control sleep-wake cycles.
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