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Your brain doesn’t have a lymphatic system like the rest of your body. Instead, it relies on sleep to activate the glymphatic system, a waste clearance mechanism that only functions during deep sleep. During sleep, your brain cells physically shrink by 60%, expanding the spaces between them so cerebrospinal fluid can flush through and remove metabolic waste, including beta-amyloid and tau proteins linked to Alzheimer’s. One night of poor sleep disrupts this process, leaving toxic buildup that compounds over time. For more Sleep-Science content follow @lunia_life