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Here are 5 things that happen to a person's brain during deep sleep

Deep sleep serves as a vital function which enables the body to eliminate toxic substances that develop in the brain, throughout daily activities. The brain uses increased cerebrospinal fluid (CSF) circulation, to perform its protective functions for the brain, and spinal cord. MRI scans reveal that deep sleep brain waves create periodic CSF waves, which remove dangerous proteins including beta-amyloid and tau from the brain

25 Nov 2025 8:00 pm