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Brain Shrinks and Cleans During Sleep
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Created October 5, 2025About this video
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Scientists discovered that your brain literally shrinks when you sleep and expands when you
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wake up. During sleep, your brain cells actually reduce in size by up to
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60 percent, creating space for cerebrospinal fluid to wash away toxins and waste products.
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This nightly brain cleaning cycle is so crucial that without proper sleep, toxic proteins linked
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to Alzheimer's disease start accumulating. So when you feel refreshed after good sleep,
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your brain has literally been deep cleaned overnight.
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