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Study suggests bright lights at night raises heart attack and stroke risk

A study of 466 Americans over 10 years found that increased nighttime artificial light exposure raises brain stress and arterial inflammation, boosting heart disease risk by up to 35%.

  • Researchers found that higher nighttime artificial light exposure measured inside participants' homes was linked to increased brain stress activity and inflamed arteries, raising major cardiac event risk.
  • Using combined Positron Emission Tomography/Computer Tomography scan, researchers measured brain stress response as a proposed causal pathway linking artificial nighttime light to heart disease.
  • In a 10-year study, 466 healthy Americans showed a 22 to 35 percent increased risk of heart disease with higher nighttime light exposure.
  • Abohashem recommended limiting indoor nighttime light, keeping bedrooms dark and avoiding screens before bed, while researchers urged cities to reduce outdoor lighting or install motion-activated streetlights.
  • Presented at the American Heart Association, this first-of-its-kind analysis linking nighttime light pollution to heart disease is preliminary and requires peer-reviewed publication for validation.
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Study suggests bright lights at night raises heart attack and stroke risk

Scientists are trying to figure out how light pollution can affect the heart.

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Mpls.St.Paul Magazine broke the news in on Monday, November 3, 2025.
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