By Hugo Francisco de Souza Reviewed by Susha Cheriyedath, M.Sc. May 14 2026 A large study maps sleep duration against multi-organ aging clocks, revealing why the healthiest biological aging profiles may cluster around the familiar 6 to 8 hour sleep window. Study: Sleep chart of biological ageing clocks in middle and late life . Image Credit: Gorodenkoff / Shutterstock In a recent study published in the journal  Nature , researchers from the MULTI consortium describe the development and