A study published in the European Heart Journal by researchers from the University of Exeter tracked more than 88,000 adults, on average 61 years old, over a period of about six years. Using a small device called an accelerometer worn on the wrist, scientists measured the exact time each participant went to sleep. They then compared these sleep times with the occurrence of cardiovascular diseases, such as heart attacks and strokes. The findings suggest that the time people go to sleep directly affects their heart and artery health. According to the study, adults who go to sleep between 10 pm and 11 pm have the lowest risk of cardiovascular issues compared to other groups. Those who fall asleep after midnight face a 25 percent higher risk of stroke or heart attack, while those who go to bed before 10 pm have a 24 percent increased risk. The link between bedtime and cardiovascular risk is especially strong in women, suggesting that sleep timing may have a more pronounced effect on their heart health. During deep sleep, blood pressure naturally decreases by 10 to 20 percent. This drop, known as nocturnal blood pressure dipping, allows the heart and blood vessels to rest and recover. Going to sleep between 10 pm and 11 pm aligns this rest period with the body's natural rhythm. However, staying up late can disrupt the circadian clock, the internal mechanism that regulates the body’s 24-hour biological cycles. Without the natural drop in blood pressure, arteries can wear out more quickly. Other research has also linked bedtime to brain aging, suggesting that the timing of sleep is as important as how long one sleeps. Both going to bed too early or too late can throw off the internal clock, which can negatively impact cardiovascular health. Additionally, recent studies show that changing one's bedtime by more than an hour from one night to the next nearly doubles the risk of a heart-related event. This means that a person who consistently sleeps late is actually at lower risk than someone whose sleep schedule fluctuates significantly, such as sleeping until 7 am during the week and 11 am on weekends. To gradually shift one’s bedtime to between 10 pm and 11 pm, three strategies have been shown to be effective. First, avoid screens at least an hour before bed, as the blue light from phones and computers can reduce the production of melatonin, the hormone that promotes sleep. Second, maintain a consistent sleep schedule, even on weekends, since the internal clock benefits from routine. Finally, get exposure to natural light early in the morning. This helps reset the circadian rhythm and makes it easier to fall asleep at night.