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Sleep. Exercise. Eat well. It’s the oldest recommendation in medicine, repeated so often it’s become a cliche. We know the advice, even if we don’t always follow it. But have you ever stopped to wonder why these three seemingly different habits have such remarkably similar effects on our brains and bodies?

If you’ve ever wondered how someone can snooze through a blaring alarm, a thunderstorm or a noisy neighbor, new research suggests the answer may lie in what the brain chooses to pay attention to during sleep

Debra Pierce holds up a picture of Stanley Sears, her brother, while standing in the yard of the mobile home he was renovating before his death in 2024. Pierce believes North Carolina’s Martin County needs higher-level emergency services and a hospital. Sarah Jane Tribble/KFF Health Newshide caption

8 things to know about the gut microbiome and keeping yours healthy diane555/Getty Images