Nighttime Light Exposure Linked to Increased Heart Damage
· World · NBC News
Exposure to even dim light during sleep is associated with measurable structural and functional damage to the heart, according to a study published in the European Heart Journal. Researchers analyzed data from 11,071 participants in the UK Biobank who wore light and motion sensors for one week before undergoing heart MRIs. The study found that individuals exposed to at least 3 lux of light—equivalent to a very dim room—exhibited a 2.4% larger left ventricle and a 1.5% thicker heart wall compared to those sleeping in darkness. These changes, known as cardiac remodeling, may contribute to higher risks of heart failure and coronary artery disease. Experts suggest that darkness should be considered a vital sign for cardiovascular health, comparable to blood pressure management.
Why it matters
This finding identifies a common, modifiable environmental factor that may contribute to long-term cardiovascular disease risk for the general population. It suggests that simple changes, such as eliminating light from street lamps or electronic devices in the bedroom, could improve heart health.
Read the original report — NBC News
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