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A study by University of Rochester Scientists in the journal Science reveals that the brain's unique method of waste removal -- dubbed the glymphatic system -- is highly active during sleep, clearing away toxins responsible for Alzheimer's disease and other neurological disorders. Furthermore, the researchers found that during sleep the brain's cells reduce in size, allowing waste to be removed more effectively. This revelation could transform scientists' understanding of the biological purpose of sleep and point to new ways to treat neurological disorders.