Evening Activity Patterns Linked to Increased Cardiovascular Risk
Overview
A large UK Biobank study found that individuals with evening activity patterns, or 'night owls,' have a 16% higher risk of first heart attack or stroke compared to average chronotypes. Night owls also exhibited poorer cardiovascular health, largely due to unhealthy behaviors such as smoking, insufficient sleep, and poor diet.
Background
Heart disease remains the leading cause of death in the U.S., with the American Heart Association emphasizing eight key factors for heart health including physical activity, tobacco avoidance, adequate sleep, healthy diet, and control of blood pressure, cholesterol, blood sugar, and weight. Circadian rhythms regulate biological processes including heart rate and metabolism, and vary among individuals. Prior research suggested night owls may have more health risks and adverse behaviors compared to early birds or average chronotypes. This study analyzed over 300,000 middle-aged and older adults to explore the relationship between evening activity patterns and cardiovascular outcomes.
Data Highlights
Chronotype
Percentage of Population
Relative Risk of First Heart Attack or Stroke
Night Owls
8%
16% higher than average
Early Birds
25%
Baseline (average risk)
Average
67%
Baseline
Key Findings
Night owls have a 16% increased risk of first heart attack or stroke over 14 years compared to average chronotypes.
Women night owls showed particularly worse cardiovascular health based on the American Heart Association’s eight key factors.
Unhealthy behaviors such as smoking, insufficient sleep, and poor diet largely explain the elevated risk in night owls.
Circadian misalignment, where night owls must conform to early schedules, disrupts metabolism and heart health.
Maintaining regular sleep and wake times and quitting smoking are recommended to mitigate risks.
Clinical Implications
Clinicians should consider patients’ chronotype and circadian rhythm alignment when advising on cardiovascular risk reduction. Encouraging night owls to adopt consistent sleep schedules, avoid tobacco, and improve diet may help offset the increased risk. Awareness of circadian influences on metabolism and behavior can guide personalized lifestyle interventions.
Conclusion
Evening activity patterns are associated with increased cardiovascular risk, primarily due to behavioral and circadian misalignment factors. Addressing modifiable lifestyle factors remains critical to improving heart health in night owls and the general population.
References
Kianersi et al. 2024 -- Evening Activity Patterns and Cardiovascular Risk
American Heart Association -- Eight Key Factors for Heart Health
