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What happens during paradoxical (REM) sleep?

Paradoxical (REM) Sleep

Paradoxical sleep is marked by irregular breathing and heart rate, increased blood supply to the brain and increased brain temperature. Most of the muscles are relaxed. There are various jerky movements of the body and face, including short bursts of rapid eye movements (REMs) which occur behind the closed eyelids. Overall, about one-quarter of our sleep is of the paradoxical kind.

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