A study involving 88,026 adults from the UK Biobank, published in European Heart Journal - Digital Health, suggests that going to bed between 10:00 PM and 10:59 PM is linked to the lowest risk of cardiovascular disease. Researchers tracked participants’ sleep patterns using wrist accelerometers over seven days and followed them for an average of 5.7 years. The findings showed that falling asleep before 10:00 PM was associated with a 24% higher risk, while going to bed after midnight correlated with a 25% higher risk. These figures reflect a combined measure of cardiovascular issues, including conditions such as high blood pressure and heart failure, rather than just heart attacks or strokes. Dr. Gérald Kierzek, a chronobiologist involved in the research, clarified that the study does not suggest a strict bedtime rule. Instead, it highlights the importance of maintaining a consistent sleep schedule. Regular sleep patterns are believed to support the body's natural rhythms, which can influence heart health and overall well-being. The study's use of accelerometers, which measure movement and can estimate sleep times more accurately than self-reported data, helps reduce potential biases. This method provides more reliable insights into participants' actual sleep behaviors, offering a clearer picture of how sleep timing affects cardiovascular health. The findings add to the growing body of research on how sleep patterns impact health. While more studies are needed to confirm these results, they suggest that aligning sleep schedules with a regular bedtime may be a simple yet effective way to support heart health.