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A new brain imaging study in mice suggests that sleep may not help flush out the brain of toxins and everyday waste products, challenging
The researchers injected a fluorescent dye into the brains of mice, watched it spread, and measured the rate of clearance when the animals were awake, asleep, and under anesthetic. "Our results challenge the idea that the core function of sleep is to clear toxins from the brain," the researchers However, while the bulk flow of fluid might increase through the brain during sleep, this does not mean the brain is clearing the fluid of waste products. Some findings support the idea, while others, like the current results, challenge it.
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