Researchers have identified an optimal sleep duration that correlates with slower biological aging, based on an analysis of nearly 500,000 health records from the UK Biobank. This investigation utilized clinical biomarkers, genetic data, blood tests, and self-reported sleep metrics gathered between 2006 and 2010 to develop machine-learning models that assess biological age across various organ systems.
Read More
The findings indicate that individuals who sleep between 6.4 and 7.8 hours per night exhibit the lowest biological aging rates in most organs. In contrast, those who sleep fewer than six hours or more than eight hours tend to show increased biological age markers.
Specifically, short sleep duration is linked to higher risks of systemic health issues such as hypertension, type 2 diabetes, obesity, and coronary artery disease. Conversely, long sleep duration is associated with increased aging markers, particularly in the brain and adipose tissue.
Furthermore, the study highlights a potential connection between sleep patterns and late-life depression. Short sleep duration can negatively impact brain circuits that regulate mood, while excessive sleep may similarly accelerate biological aging in tissues related to mood regulation. However, the authors caution that unusual sleep patterns may not be direct causes of organ damage but could indicate underlying health issues.
The research primarily relies on observational data and self-reported sleep metrics, raising questions about recall bias and causality. Future studies are needed to explore whether targeted sleep interventions can influence organ aging rates and to better understand the genetic and environmental factors linked to sleep-related health outcomes.
This analysis was published in Nature on August 21, 2024, with lead author Junhao Wen.