Sympathetic nerve activity decreases from wakefulness during which sleep stage?

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Multiple Choice

Sympathetic nerve activity decreases from wakefulness during which sleep stage?

The main concept here is how the autonomic nervous system shifts across sleep stages. During non-REM sleep, the body settles into a more resting state, and sympathetic outflow decreases relative to wakefulness. This leads to lower heart rate, reduced blood pressure, and overall calmer physiological activity. REM sleep, by contrast, is characterized by autonomic instability with occasional sympathetic bursts, so the steady decline from wakefulness is not seen there. Stage 2 is a lighter part of non-REM sleep, but the greatest reduction in sympathetic activity compared with wake occurs across non-REM sleep in general, especially as sleep deepens. Therefore, the stage associated with the decrease from wakefulness is non-REM sleep.

The main concept here is how the autonomic nervous system shifts across sleep stages. During non-REM sleep, the body settles into a more resting state, and sympathetic outflow decreases relative to wakefulness. This leads to lower heart rate, reduced blood pressure, and overall calmer physiological activity. REM sleep, by contrast, is characterized by autonomic instability with occasional sympathetic bursts, so the steady decline from wakefulness is not seen there. Stage 2 is a lighter part of non-REM sleep, but the greatest reduction in sympathetic activity compared with wake occurs across non-REM sleep in general, especially as sleep deepens. Therefore, the stage associated with the decrease from wakefulness is non-REM sleep.

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