Study Links Sleep Duration to Aging and Health Risks
A comprehensive analysis involving half a million adults has identified a potential sweet spot for sleep — around six to eight hours a day. This amount of sleep appears to correlate with a reduced risk of early mortality and various diseases.
On the other hand, getting too much or too little sleep might accelerate the aging process. Researchers measured this effect using around two dozen biological aging clocks designed to indicate how aging impacts the body.
The findings, published in Nature on May 13, don’t necessarily assert that six to eight hours is ideal for everyone nor do they confirm that achieving this range directly enhances health or decelerates aging. However, the study sheds light on the complexity of the relationship between sleep and aging.
This research supports an encouraging notion: improving sleep duration could potentially help lower the risk of age-related diseases. Abigail Dove, a neuroepidemiologist at Karolinska Institute in Stockholm, argues that sleep affects every organ and is somewhat adjustable. “This is a tool that could help,” she notes.
Exploring Sleep Variations
Previous studies have also looked into how sleep duration correlates with one’s biological age, often assessed through biomarker data. One particular study found a U-shaped relationship, noting that participants who logged about seven hours of sleep daily had the smallest gap between their biological and chronological ages. Those sleeping significantly more or less seemed to experience quicker aging.
Junhao Wen, a computational neuroscientist at Columbia University in New York, who describes himself as a light sleeper often waking up during the night, sought to understand how sleep duration affects specific organs and bodily systems. His team utilized the UK Biobank, a long-term health study of over 500,000 individuals, which includes a wealth of health-related data like lifestyle surveys, brain scans, and blood samples.
The researchers aimed to find genetic connections to abnormal sleep patterns but discovered very few. “Sleep might be more environmental,” Wen suggests, emphasizing that this could be a hopeful message, indicating that sleep habits can be modified.
Variability Among Organs
Some research has indicated that different organs age at distinct rates. Wen and his colleagues explored the relationship between sleep duration and 23 biological aging clocks representing 17 different organs. These clocks were based on either protein or metabolite levels or certain features observed in medical imaging.
