The deep sleep circuit that rebuilds you

Deep sleep does far more than rest your mind. Scientists found a circuit in the brain that links deep sleep to a burst of growth hormone. The two feed each other in a loop. This loop helps the body build muscle, burn fat, and keep the brain sharp. It is a clue to why one good night changes how you feel and look. When you skip deep sleep, you lose part of that quiet repair work. The team says this shows how sleep shapes the whole body, not just the mind.

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