Human study · Research · 11 Sept 2026
Too much light at night may quietly reshape your heart
Source: ScienceDaily
What the research found
Study (observational). Tulane’s Lu Qi and colleagues, in the European Heart Journal, studied 11,071 UK Biobank adults who wore a wrist light sensor for seven days and later had cardiac MRI. Nighttime light above about 3 lux, versus almost none, was linked to thicker left-ventricular walls, less chamber space, and stiffer pumping — remodeling also seen in other chambers. Association is not proof that blackout curtains prevent heart failure. Educational sleep-environment notes, not medical advice.
Evidence level: Human study. A study in people, but an association isn't proof of cause.
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