Why You’re Waking Up Tired – Even After 8 Hours of Sleep

By Claire Wolters, Aug 25, 2025

Doctors and researchers generally recommend that adults sleep seven to eight hours at night. Dr. Alex Dimitriu, who is double board-certified in psychiatry and sleep medicine and the founder of Menlo Park Psychiatry & Sleep Medicine, says that younger adults may need more sleep than older adults, but not by much. Recommended increases are closer to a few minutes than a few hours and “will likely fall into the seven to eight hour range,” he adds. While not everyone needs a full eight hours of sleep, Dimitriu encourages people to aim for the higher end of the range in order to confidently lock in their Zs.

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