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    Sleep: When Brain Cells Shrink & Neuro Trash Is Flushed Away

    This image from a mouse brain shows the fluid channels (purple) and glia cells (green) flush out the brain’s waste into blood vessels.Jeffrey Iliff1 and Maiken Nedergaard For humans, sleep is an absolute requirement for survival, almost on par with food and water. When we don’t get it, we not only feel terrible, but our […]