Where Bright Lights Are Switched on at Night, Heart Troubles Follow
Researchers found that the brightest sleepers had a 29% higher heart failure risk and subtle heart damage after up to 10 years of follow-up.
- Published Wednesday in the European Heart Journal, a new study links nighttime light exposure above 3 lux to harmful changes in heart structure and function, potentially elevating cardiovascular disease risks.
- Light at night disrupts the body's natural 24-hour circadian clock, preventing heart cells from removing damaged components while sleeping and leading to pathologic heart growth and dysfunction.
- Analyzing 11,071 participants, researchers found the highest light exposure group faced 29% increased heart failure risk and 33% higher stroke risk, with MRI scans revealing 2.4% larger left ventricles.
- Experts recommend clinicians ask patients about bedroom darkness and screen use before sleep; Dr. Thomas Münzel suggested cities reduce light pollution using shielded streetlights and warm-spectrum bulbs.
- The observational study cannot establish direct causation and relied on a 1-week assessment period; future research may examine specific light spectrums, particularly blue-heavy LED light, on cardiac outcomes.
13 Articles
13 Articles
Where Bright Lights Are Switched on at Night, Heart Troubles Follow
(MedPage Today) -- The concept that there are cardiovascular harms of nighttime light exposure gained greater credence with a large new study. Based on the U.K. Biobank cohort, people with more light exposure (>3 lux) during normal sleep hours...
Too much light at night may quietly reshape your heart
Nighttime light exposure was linked to thicker, stiffer heart chambers and early signs of reduced heart function in a study of more than 11,000 people. The findings suggest that keeping bedrooms darker could be an overlooked strategy for protecting the heart.
Sleeping with even small amounts of light can affect the structure and function of the heart and increase the risk of cardiovascular problems in the future, a new study suggests, CNN reported. Researchers found that people who slept in environments with more than...
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