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REM Sleep
A phase of sleep characterized by rapid eye movement, during which dreaming often occurs and brain activity is similar to that of being awake.
Sleep Cycle
A progression through several stages of NREM and REM sleep, repeating several times throughout a typical night's rest.
Sleepwalks
The act of walking or performing other complex behaviors while in a state of sleep.
Stage
A specific phase or period in a process of development or a sequence of events.
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