Nature Study Links 6.4-7.8 Hours of Sleep to Slower Organ Aging
Updated
Updated · The Washington Post · May 26
Nature Study Links 6.4-7.8 Hours of Sleep to Slower Organ Aging
2 articles · Updated · The Washington Post · May 26
6.4 to 7.8 hours of nightly sleep was tied to the healthiest molecular aging profiles across nearly every organ, according to a Nature study led by Columbia's Junhao Wen.
500,000 UK Biobank volunteers underpinned the analysis, which used organ-specific aging clocks and found a U-shaped pattern: both shorter and longer sleep tracked with faster aging.
7.7 hours appeared optimal for men in one brain measure, while women did best at about 7.82 hours, suggesting women may need roughly 15 to 20 minutes more sleep.
8-plus hours may reflect underlying illness rather than sleep itself causing harm, and the observational study cannot prove causation.
6 to 8 hours remains guidance rather than a rule, the researchers said, noting sleep needs vary by person and the dataset skewed toward White Europeans.
Is sleeping over 8 hours a symptom of poor health, or could it be the direct cause of faster aging?
For healthy aging, is a consistent sleep schedule more crucial than hitting the 'perfect' number of hours each night?
Optimal Sleep Duration Linked to Slower Organ Aging: Insights from a 500,000-Person Study Using Biological Aging Clocks
Overview
A major study led by Junhao Wen at Columbia University, published in Nature in May 2026, analyzed data from nearly 500,000 UK Biobank participants to explore how sleep duration affects biological aging. Using advanced aging clocks and multimodal data—including imaging, proteomics, and metabolomics—the research found a clear U-shaped link: both too little and too much sleep are associated with faster aging across multiple organ systems. This discovery highlights the importance of maintaining an optimal sleep range to slow biological aging, offering new insights for healthier aging and more personalized sleep recommendations.