Evidence that sleep functions to repair and restore the brain and body comes from the research find that vigorous activity, especially late in the day, causes an increase in:

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Slow-wave sleep, also known as deep sleep, is the stage of sleep in which the body can repair and restore itself. Studies have shown that intense physical activity can increase the amount of slow-wave sleep at night, indicating that this stage of sleep is important for physical restoration. Additionally, slow-wave sleep has been linked to memory consolidation and improvements in cognitive performance.

Evidence That Sleep Functions to Repair and Restore the Brain