Unformatted text preview: outwardly during the sleep episodes, such as continuing a conversation or putting things away. But when they wake up, they have no memory of the event. Sleep researchers have identified several different types of sleep in humans. One type of sleep is called rapid eye movement (REM) sleep, because the person's eyes move rapidly back and forth underneath the closed eyelids. REM sleep is associated with dreaming. Normally, when people fall asleep, they experience 90 minutes of non-REM sleep, which is then followed by a phase of REM sleep. People with narcolepsy, however, enter REM sleep immediately. In addition, REM sleep occurs inappropriately in patients with narcolepsy throughout the day....
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- Fall '09
- Excessive daytime sleepiness, sleep attacks