![]() These episodes of excessive daytime sleepiness can occur at any time, during any activity. In between “sleep attacks,” people have normal levels of alertness. This is a sudden overwhelming urge to sleep, despite feeling rested. The following sections look at these symptoms in more detail: Excessive daytime sleepiness While excessive daytime drowsiness affects everyone with narcolepsy, only 10% to 25% of people will experience all of the other symptoms, too. The most common symptoms of narcolepsy are: In most cases, it’s a lifelong condition. While the severity of the symptoms may vary over time, the disorder itself is not progressive, meaning it doesn’t get worse over time. Other names for narcolepsy, though not commonly used, include: This explains the loss of muscle tone and the vivid visual hallucinations patients with narcolepsy may experience during the sleep attacks They can also enter this sleep stage during periods of wakefulness. Someone with narcolepsy may enter REM sleep immediately. To prevent us from acting out on our dreams, our brain sends signals to our muscles and limbs to become paralyzed. ![]() ![]() It takes an average adult about 90 minutes to enter rapid eye movement (REM) sleep. To better understand the symptoms of narcolepsy, we need to learn more about how a regular sleep cycle works: These episodes vary in frequency and can occur multiple times during a single day. Attacks of sleepiness can last a few seconds or several minutes. This is called daytime sleepiness, sometimes called EDS. Narcolepsy, a neurological sleep-wake disorder, causes chronic attacks of sleepiness during the day and poor sleep at night.
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