Which sleep stage is most associated with penile tumescence and vaginal engorgement?

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Multiple Choice

Which sleep stage is most associated with penile tumescence and vaginal engorgement?

REM sleep is the stage where the body’s autonomic activity increases in a way that promotes genital arousal. During this stage you have vivid dreams, rapid eye movements, and brain activity similar to waking, but with most skeletal muscles inhibited. Parasympathetic activation during REM leads to genital vasodilation, producing penile tumescence in men and vaginal engorgement in women. In contrast, non-REM sleep involves deeper, more stable sleep with less autonomic fluctuation, so pronounced genital engorgement is not typical. While erections can occur at other times, the most characteristic association is with REM sleep.

REM sleep is the stage where the body’s autonomic activity increases in a way that promotes genital arousal. During this stage you have vivid dreams, rapid eye movements, and brain activity similar to waking, but with most skeletal muscles inhibited. Parasympathetic activation during REM leads to genital vasodilation, producing penile tumescence in men and vaginal engorgement in women. In contrast, non-REM sleep involves deeper, more stable sleep with less autonomic fluctuation, so pronounced genital engorgement is not typical. While erections can occur at other times, the most characteristic association is with REM sleep.

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