A recent study involving nearly half a million adults has revealed that sleeping between six to eight hours per night is associated with the lowest signs of biological aging. Individuals who reported sleeping less than six hours or more than eight hours demonstrated faster aging across various organs and bodily systems.
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While the study does not claim that exactly seven hours of sleep will universally slow aging, it highlights the link between sleep duration and aging across multiple physiological systems, including the brain, liver, lungs, immune system, pancreas, and skin.
Junhao Wen, a computational neuroscientist at Columbia University and lead author of the study, utilized data from the UK Biobank, which encompasses over 500,000 participants aged 37 to 84. The researchers compared self-reported sleep durations with 23 biological aging clocks that estimate the biological age of different body parts using MRI scans, blood protein levels, and metabolites.
The findings, referred to as the Sleep Chart, identified a U-shaped relationship between sleep duration and biological aging. Optimal sleep duration was found to be approximately 6.4 to 7.8 hours per night, varying by organ system and gender. Nine of the biological aging clocks indicated significant connections with sleep duration, demonstrating pronounced effects on various bodily systems.
The results underscore the potential health risks associated with inadequate sleep. Shorter sleep durations have been linked to health issues such as inflammation, hypertension, changes in blood sugar, weight gain, and mental health problems. The study suggests that inadequate sleep is correlated with accelerated biological aging and an increased risk of several diseases, including depression, diabetes, obesity, and heart disease. Participants sleeping less than six hours had a 50% higher risk of death from any cause, while those exceeding eight hours had a 40% higher risk.
However, the relationship between long sleep and biological aging remains complex. Those who slept more than eight hours also exhibited signs of faster aging, which may reflect underlying health issues rather than purely unhealthy sleep patterns. Factors such as depression, chronic inflammation, or medication can contribute to extended sleep durations.
Despite the findings, it is important to note that the sleep duration data was based on questionnaires, which may not always reflect accurate sleep habits. This limitation could affect the study's conclusions, as cause-and-effect relationships cannot be definitively established. Nonetheless, the research reinforces the notion that sleep impacts overall health and well-being, aligning it with key health components such as diet and exercise.