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Nighttime habit may impact heart structure
The study indicates that exposure to light at night exceeding 3 lux may be associated with unhealthy changes in heart structure and function, including a 1.5% increase in the thickness of the left ventricular walls and cardiac hypertrophy, as well as a roughly 1.9% decrease in cardiac contraction efficiency. It also notes unfavorable patterns in the right ventricle and left atrium. The findings suggest that increased exposure to light at night contributes to dose-dependent heart changes, and it is believed that sleep disturbances caused by melatonin inhibition may partially explain these alterations. Although the study remains observational, it underscores the importance of minimizing nighttime light exposure—such as using dark curtains or avoiding phone and screen illumination before sleep—to help preserve heart health.
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