Light at night predicts heart health

Circadian clocks throughout the body do different tasks at different times of day. When these clocks are disturbed with unhealthy light, these tissues do not function properly. Using personal light data in over 88,000 people, we found that bright nights had significantly higher risks of developing coronary artery disease, myocardial infarction , heart failure, atrial fibrillation , and stroke . These relationships were robust after adjusting for established risk factors for cardiovascular health, including physical activity, smoking, alcohol, diet, sleep duration, socioeconomic status, and polygenic risk.

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