A bedroom that feels comfortably dim may seem like a small detail when it is time to sleep. But new research suggests that the amount of light surrounding you at night could be linked to changes happening deep inside the heart.
A study of more than 11,000 people has found an association between greater exposure to light at night and changes in the structure and function of the heart. Researchers observed thicker heart muscle, reduced flexibility and other signs that the heart may be adapting to prolonged stress.
