
Moonlight on the heart? Dim night light linked to heart changes, study suggests
A large study of over 11,000 people without heart disease tracked nighttime light exposure for seven days and followed up with cardiac MRIs three years later, finding that exposure to light levels above 3 lux during sleep was associated with changes in heart muscle shape and function compared with those with no light exposure; 3 lux is roughly moonlight. The study, published in the European Heart Journal, notes limitations in testing duration and sensor methods and calls for further research.













