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Nighttime light exposure and cardiovascular health

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2026-09-12 15:56 UTC → 2026-09-12 17:45 UTC · added ~~removed~~

Research published in the European Heart Journal indicates that nighttime light exposure is associated with adverse changes in heart structure and function. A study involving researchers from Tulane University ~~involving over 11,000~~ and Harvard University analyzed data from 11,071 participants in the UK Biobank to investigate the link between light levels during sleep and cardiovascular health. Using wrist-worn sensors to measure light exposure over one week and cardiac MRI scans three years later, the study found that individuals exposed to more than 3 lux of light ~~during sleep~~ at night showed signs of cardiac remodeling. Specific findings included the thickening of left ventricular walls, which reduced internal chamber space, and a decreased ability for the heart muscle to relax and contract efficiently. Similar structural changes were observed in the right ventricles and left atrium. While researchers noted the study is observational and does not prove direct causation, they suggest that factors such as sleep duration may contribute but do not fully explain the observed effects. Experts recommend maintaining a dark sleeping ~~environments may~~ environment, ideally below 1 lux, to mitigate potential cardiovascular risks.

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