What’s the number one thing I can do to help prevent dementia? Be in bed by 10 p.m. “The earlier you get to sleep, the more slow-wave sleep you’ll get,” says Sara Mednick, a professor of cognitive science at the University of California, Irvine, and author of The Power of the Downstate. Slow-wave sleep (SWS) supercharges brain health, clearing away toxins and other buildup that cause dementia, as well as developing connections between areas of the brain to create stronger memories.

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