Which sleep stage shows decreased brain activity and blood flow from wakefulness, especially in the cerebral cortex?

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Multiple Choice

Which sleep stage shows decreased brain activity and blood flow from wakefulness, especially in the cerebral cortex?

Non-REM sleep is when brain activity and cerebral blood flow fall below wakeful levels, with the largest reductions occurring during deep non-REM sleep (slow-wave sleep) in the cerebral cortex. This indicates a lower metabolic demand and less cortical activity compared to being awake. REM sleep, on the other hand, can show brain activity that is quite high and resembles wakefulness in many regions, so it doesn’t fit the description of a widespread decrease. Wakefulness has the highest metabolic rate, and Stage 2 is a lighter non-REM stage with less pronounced reductions than deep sleep.

Non-REM sleep is when brain activity and cerebral blood flow fall below wakeful levels, with the largest reductions occurring during deep non-REM sleep (slow-wave sleep) in the cerebral cortex. This indicates a lower metabolic demand and less cortical activity compared to being awake. REM sleep, on the other hand, can show brain activity that is quite high and resembles wakefulness in many regions, so it doesn’t fit the description of a widespread decrease. Wakefulness has the highest metabolic rate, and Stage 2 is a lighter non-REM stage with less pronounced reductions than deep sleep.

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