REM sleep is initiated by a rise in _____, which activates the cerebral cortex while the rest of the brain remains relatively inactive.

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REM sleep is initiated by a rise in acetylcholine, which activates the cerebral cortex while the rest of the brain remains relatively inactive. Serotonin and norepinephrine levels decrease during REM sleep, and cortisol levels tend to be highest in the morning, not during REM sleep.

REM Sleep Is Initiated by a Rise in _____, Which