Many of us feel sleepy in daytime. However, we often comfort ourselves that is because we young people are busy with our works. We have to stay up late at night. Due to the lack of night sleep, so it is normal we feel sleepy during daytime. But actually you may have narcolepsy.
Narcolepsy is a chronic neurological disorder affecting that part of the brain that regulates the timings of sleeping and waking. People with narcolepsy experience excessive daytime sleepiness and intermittent, uncontrollable episodes of falling asleep during the daytime. And narcolepsy may occur when you do any kind of activity.
People with narcolepsy may feel an overwhelming urge to sleep at various points in the day, and they will often fall asleep spontaneously for a few seconds to a few minutes. In extreme cases, people with narcolepsy will remain asleep for over an hour.
The first reason is gene. When we mention the causes of narcolepsy, actually, doctors can seldom explain why one person gets narcolepsy and another does not. Research scientists currently believe that narcolepsy may be caused by multiple factors interacting to cause neurological dysfunction and sleep disturbances and they have also made progress toward identifying genes strongly associated with the disorder. These genes control the production of chemicals in the brain that may signal sleep and awake cycles.
Next reason may be associated with normal sleep. Each of us knows that at the beginning of sleep we usually experience a phase called non-rapid eye movement sleep. During this phase, your brain waves slow considerably. After an hour or two of NREM sleep, your brain activity picks up again, and REM sleep begins. Most dreaming occurs during REM sleep. However, people who have narcolepsy may suddenly enter into REM sleep without first experiencing NREM sleep. Some of the characteristics of REM sleep, such as sudden lack of muscle tone, sleep paralysis and vivid dreams, occur during other sleep stages in people with narcolepsy.
Of course there is another reason is also linked with narcolepsy. Hypocretin is an important chemical in our brain that helps regulate wakefulness and REM sleep, which specifically has properties that promote wakefulness and inhibits REM sleep. People with narcolepsy have low levels of this neurochemical in their spinal fluid. It's particularly low in those who experience cataplexy.
With above information, I believe you have gotten much details about narcolepsy. But the causes of narcolepsy are more than these three points, sometimes stress, exposure to toxins and infections may also lead to narcolepsy.
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