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Every night, while you're asleep, your brain runs a cleaning cycle that clears out the kind of toxic buildup linked to Alzheimer's and dementia. And, with age, most of us sleep less. We are shortchanging the benefits without ever realizing how much control we actually have over sleeping longer, and better.Dr. Rebecca Robbins is an Assistant Professor in Sleep Medicine at Harvard Medical School and an Associate Sleep Scientist at Brigham and Women's Hospital, where her research spans sleep's relationship to cognitive function, cardiometabolic health, and long-term brain health. She's published more than 100 peer-reviewed studies, co-authored Sleep for Success!, and her work is exactly the kind of research most of us never hear about until someone frames it the way she does here.In this conversation, you'll explore:Why sleep really does shift around age 38 to 40, and what that shift does and doesn't mean for youThe neuroscience discovery of the brain's overnight "wash cycle," and what Dr. Robbins's own eight-ye