
When you sleep, A wave of cerebrospinal fluid flows out of the brain, helping to wash away waste products that have built up during the day. “If you don’t sleep, the CSF waves start to intrude into wakefulness where normally you wouldn’t see them. However, they come with an attentional tradeoff, where attention fails during the moments that you have this wave of fluid flow,” says MIT Professor Laura Lewis. news.mit.edu/2025/your-brai…
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