This syndrome, which tends to affect people throughout their lifetime, only affects about 3 in 10,000 people. The first and most important symptom is the sudden urge to sleep during the day. The sleepiness this involves is so intense that the person is unable to stay awake. It is not difficult to rouse the affected person from their sleep. When the person wakes up, he or she may feel rested, but the fatigue can creep up very quickly and cause another bout of sleep. In the most severe cases, this can happen several times a day.
The main test for diagnosing narcolepsy in a sleep disorder laboratory is called Multiple Sleep Latency Test (MSLT). Once the diagnosis of narcolepsy has been confirmed, symptomatic is used to manage drowsiness during the day and to prevent the onset of REM sleep when the person is awake (cataplexy, sleep paralysis and hallucinations). That said, there is currently no cure for narcolepsy.
Source: Canadian Sleep Society
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