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Narcolepsy is a chronic neurological disorder that impairs the ability to regulate sleep–wake cycles, and specifically impacts REM (rapid eye movement) sleep. [1] The pentad symptoms of narcolepsy include excessive daytime sleepiness (EDS), sleep-related hallucinations, sleep paralysis, disturbed nocturnal sleep (DNS), and cataplexy. [1]
Sleep onset is the transition from wakefulness into sleep. Sleep onset usually transits into non-rapid eye movement sleep (NREM sleep) but under certain circumstances (e.g. narcolepsy) it is possible to transit from wakefulness directly into rapid eye movement sleep (REM sleep).
Slow-wave sleep (SWS) potentially decreases (and is sometimes absent), spindles and the length of time spent in REM sleep are also reduced, while its latency increases. [17] Poor sleep onset in AD has been associated with dream-related hallucinations, increased restlessness, wandering, and agitation related to sundowning —a typical ...
Another tool is the Multiple Sleep Latency Test (MSLT), which has been used since the 1970s. It is used to measure the time it takes from the start of a daytime nap period to the first signs of sleep, called sleep latency. Subjects undergo a series of five 20-minute sleeping opportunities with an absence of alerting factors at 2-hour intervals ...
Presenting with the tetrad of symptoms (excessive daytime sleepiness, sleep-onset paralysis, hypnagogic hallucinations, and cataplexy symptoms) is strong evidence of the diagnosis of narcolepsy. A multiple sleep latency test [clarification needed] is often conducted to quantify daytime sleepiness. [14]
The MSLT measures, by several nap opportunities in one day, how long it takes a person to fall asleep. It also determines whether REM sleep appears upon falling asleep. [2] [4] It is usually performed immediately after an overnight study. This test is the standard to test for narcolepsy and idiopathic hypersomnia. [5]
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