Simple Habit Change Could Cut Heart Disease Risk by 50%, Scientists Say

New research suggests that maintaining a consistent bedtime could significantly reduce the risk of heart disease, with findings indicating that individuals who go to sleep at roughly the same time each night may lower their risk by up to 50 percent compared to those with irregular sleep patterns.

The study, published in BMC Cardiovascular Disorders, followed 3,231 Finnish adults born in 1966 over a 10-year period. Participants wore research-grade wrist sleep monitors for seven days to track when they fell asleep, woke up, and the midpoint of their sleep. Researchers then cross-referenced this data with Finland’s national health registry to monitor incidents of heart attack, stroke, heart failure hospitalization, and cardiovascular-related death.

Participants were grouped based on their bedtime consistency: those with a regular bedtime, those with a fairly regular bedtime (falling asleep within one hour of the same time each night), and those with an irregular bedtime (falling asleep within nearly two hours of the same time nightly). After adjusting for age and sex-related cardiac risk factors, those with irregular bedtimes showed twice the risk of heart disease compared to individuals with consistent sleep schedules.

Experts involved in the research emphasize that while sleep duration is important, the timing of sleep plays a critical role in cardiovascular health. John La Puma, M.D., a board-certified internist and sleep specialist, noted that the body’s internal clock responds strongly to regularity, and disruptions in sleep timing can negatively affect heart function over time.

Srihari Naidu, M.D., a cardiologist and professor of medicine at New York Medical College, highlighted that the findings add to growing evidence that sleep hygiene — particularly consistency — should be considered alongside diet and exercise as a key component of heart disease prevention. He explained that irregular sleep patterns may disrupt circadian rhythms, leading to increased inflammation, blood pressure fluctuations, and other stressors on the cardiovascular system.

The study adds to a growing body of research linking sleep behavior to long-term health outcomes. Previous studies have shown that poor sleep quality and duration are associated with hypertension, obesity, and insulin resistance — all risk factors for heart disease. However, this research specifically isolates bedtime consistency as an independent factor influencing cardiovascular risk, even when controlling for total sleep duration and other health variables.

While the study demonstrates a strong association between irregular bedtimes and increased heart disease risk, researchers caution that it does not prove causation. Observational studies like this one can identify patterns but cannot definitively conclude that inconsistent bedtimes directly cause heart disease. Further research, including controlled trials, would be needed to establish a causal relationship.

Despite this limitation, the findings support the inclusion of sleep regularity in public health recommendations for heart disease prevention. Health experts suggest that individuals aiming to improve their cardiovascular health should consider not only how much they sleep but also when they sleep, aiming for a consistent bedtime and wake time, even on weekends.

As heart disease remains a leading cause of death globally, simple, low-cost interventions like maintaining a regular sleep schedule could offer meaningful preventive benefits. The study underscores the importance of viewing sleep not merely as a passive state but as an active contributor to long-term heart health.