Avoiding artificial light at nighttime could lower the risk of cardiovascular disease, research suggests.

The study, in JAMA Network Open , linked higher exposure to nighttime light with coronary heart disease, stroke, atrial fibrillation, myocardial infarction, and heart failure.

Comparing 13 million hours of personal light exposure data with 700,000 person-years of follow-up, researchers found that the risk of a heart attack was approximately 50% higher for people with the brightest compared with darkest nights.

Conversely, greater daytime light exposure was protective and associated with a reduction in the prospective risk of cardiovascular disease compared with lower exposure.

“To our knowledge, this is the first study of personal light exposure patterns and incident cardiovasc

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