UNIVERSITY PARK, Pa. — When it comes to sleep, traditional advice has focused on the number of hours a person sleeps. But for older adults, the quality of sleep may affect cognitive performance the following day regardless of their quantity of sleep, according to a new study by researchers from the Penn State College of…

Later sleep and wake times tied to poor diet and sedentary behavior in teens Credit: Capuski/Getty Images.

November 1, 2025 ByMaureen Salamon, Executive Editor, Harvard Women’s Health Watch

We’ve all heard the phrase “make sure to get eight hours of sleep” – but recent research shows that the optimal range of shut-eye could be lower than you might think

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