Heart disease risk may be linked to sleeping conditions. Experts recommend a very dark bedroom for quality sleep. A measurement of illumination shows that the ideal bedroom should have no more than a certain level of brightness.

Further details on this potential health risk are available from the study's findings. Researchers have identified a possible connection between light exposure during sleep and heart muscle changes.

This information suggests that reducing nighttime light could be a strategy for preventing heart disease, according to a professor and director of a research center.