If you regularly sleep fewer than 6.5 hours—or make a habit of sleeping more than 8 hours—your organs may be aging faster than they should, a recent study warns.
Researchers found that people who sleep outside a narrow window of 6.4 to 7.8 hours show signs of faster organ aging compared with those who stay within that range. These people also faced a higher risk of chronic diseases, including diabetes, heart disease, and depression.
This suggests that striking the right sleep balance may be key to staying healthier and younger as we age.
The Narrow Sleep Window Best for Health
The study drew on self-reported data from 500,000 participants in the UK Biobank and used 23 computer models called “aging clocks” to estimate how quickly different organs were aging relative to a person’s actual age.
These clocks were built using structural data from medical imaging, organ-specific proteins, and molecules found in the blood. They can provide personalized information about aging in specific organs, including the brain, heart, and lungs.
The findings, recently published in Nature, showed that 6.4 to 7.8 hours of sleep was healthiest for women, while 6.4 to 7.7 hours was healthiest for men.
“Everyone is excited by these aging clocks and their ability to predict disease and mortality risk,” study leader Junhao Wen, assistant professor of radiology at Columbia University Vagelos College of Physicians and Surgeons, said in a press statement. “But to me, the more exciting question is, can we link aging clocks to a lifestyle factor that can be modified in time to slow aging?”
While this observational study does not prove that sleep duration directly causes faster aging, it does show a link between sleep habits and overall health.
Sleep Habits and Chronic Disease
Both too little and too much sleep were associated with faster aging across nearly every organ—supporting the idea that sleep plays a central role in maintaining what Wen described as “a coordinated brain-body network, including metabolic balance and a healthy immune system.”
The study linked abnormal sleep duration to a range of medical conditions, including obesity, Type 2 diabetes, high blood pressure, heart disease, and irregular heartbeats. It also found connections to respiratory conditions such as chronic obstructive pulmonary disease and asthma, as well as gastrointestinal problems such as acid reflux and gastritis.
Data from nine of the aging clocks showed statistically significant links between sleep duration and aging in organs, including the brain, heart, immune system, and skin. These associations were strongest among people who slept for shorter durations.
Increased Risk of Late-Life Depression
Wen and his team found that too little sleep was associated with mental health issues such as depression and anxiety. Researchers also found that sleeping too much could influence depression risk through changes in brain and fat-tissue aging.
Dr. Alex Dimitriu, who is board-certified in psychiatry and sleep medicine and was not involved in the study, told The Epoch Times these findings confirm what he’s observed in his practice: Both too little and too much sleep are associated with worse health outcomes.
“It reinforces that 7 to 8 hours is the sweet spot for most adults,” he said. “It’s a modifiable risk factor we can control.”
Dimitriu added that it’s also good to know that 7 hours may be sufficient for most adults. “So we stop beating ourselves up about not getting 8 [hours]. Just don’t let that become a slippery slope, and start sleeping 6 hours!”
Sleep Quality Matters as Much as Duration
Sleep quality and sleep duration are both essential for overall health, Chelsie Rohrscheib, head sleep expert and neuroscientist at Wesper, a clinical-grade sleep testing and management platform, and who was not involved in the study, told The Epoch Times.
“Poor sleep in either area can increase the risk for numerous chronic health conditions while reducing quality of life,” she said.
Research published last year in the journal Health Data Science has linked 172 different diseases to poor sleep patterns.
Rohrscheib said there are warning signs that your sleep habits might be negatively affecting your health. These include:
- Chronic daytime sleepiness
- Difficulty concentrating
- Memory problems
- Irritability
- Low mood
- Reduced performance at work or school
Dimitriu recommended protecting what he calls your “sleep window” with dim lighting, reduced stimulation, and a quiet pre-bed routine.
“Aiming for 8 hours usually gets you about 7 quality hours,” he said—which, according to this study, is right where you want to be for the best aging outcomes.