A large-scale study drawing on data from the UK Biobank has revealed a clear association between sleep duration and the pace of biological aging. Researchers from Columbia University and international institutions analyzed health records and biological markers from nearly 500,000 participants, finding that both insufficient and excessive sleep are linked to accelerated aging across multiple organ systems.
The study, led by Junhao Wen, assistant professor of radiology at Columbia University Vagelos College of Physicians and Surgeons, used machine learning to construct “biological ageing clocks.” These tools estimate how much faster or slower a person’s body is aging compared to their chronological age, based on brain scans, blood proteins, and chemical markers. The results showed a consistent U-shaped pattern: those who slept between six and eight hours per night exhibited the healthiest biological profiles, while those sleeping fewer than six or more than eight hours showed signs of faster aging.
Organ-Specific Effects and Disease Links
The impact was observed across the brain, lungs, liver, immune system, skin, and metabolism. Short sleep was particularly associated with brain-related disorders such as depression and anxiety, aligning with previous research on sleep and mental health. Beyond neurological conditions, short sleep was also linked to heart disease, type 2 diabetes, obesity, asthma, and digestive issues like reflux.
Long sleep, defined as more than eight hours, was also connected to health problems, though researchers caution that it may sometimes reflect underlying illness rather than being a direct cause. “The broad brain-body pattern is important because it tells us that sleep duration is a deeply embedded part of our entire physiology, with far-reaching implications across the body,” Wen said.
Wen added: “Previous studies have found that sleep is largely linked to ageing and the pathological burden of the brain. Our study goes further and shows that too little and too much sleep are associated with faster aging in nearly every organ, supporting the idea that sleep is important in maintaining organ health within a coordinated brain-body network, including metabolic balance and a healthy immune system.”
The study, published in the journal Nature Communications, highlights the interconnectedness of sleep with overall health. However, the researchers warn that the observational nature of the data cannot prove causation. Much of the sleep information came from self-reports, which are less precise than direct measurements. They call for further research to determine whether poor sleep directly accelerates aging or whether pre-existing health conditions disrupt sleep patterns.
For European readers, the findings resonate with ongoing public health discussions across the continent. In countries like Germany, France, and the Netherlands, sleep hygiene has become a growing focus, with initiatives promoting consistent bedtimes and reduced screen time. The study’s reliance on UK Biobank data—a resource that includes participants from England, Scotland, and Wales—adds a specifically European dimension to the evidence.
As the European Union grapples with rising healthcare costs and aging populations, understanding modifiable risk factors like sleep duration could inform preventive strategies. The study’s authors emphasize that maintaining a sleep duration in the middle range—roughly seven to eight hours—may be a simple yet effective way to support healthy aging across the body.
