A study published in The Journal of Neuroscience has revealed a shocking effect of sleep deprivation—the brain begins consuming its own healthy cells. Researchers found that prolonged wakefulness causes astrocytes, the brain’s maintenance cells, to over-prune synapses, while microglia, the brain’s immune cells, enter a hyperactive state linked to inflammation. These processes, meant to protect the brain, instead accelerate neural breakdown when sleep is chronically lacking.

While sleep is essential for clearing out waste and optimizing brain function, losing too much of it may push the brain toward long-term damage. This research reinforces the importance of deep, consistent sleep—not just for energy, but to prevent the brain from harming itself over time.

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