Don’t Sleep With Any Lights On For Better Health, Study Finds

With those with greater exposure to light at night, a link was seen with excess weight (obesity), as well as cardiometabolic health perturbations related to blood sugar balance and blood pressure.

Based on the findings from this study, there appears to be a link between light at night and obesity and/or suboptimal metabolic health. Participants who were not exposed to light at night, namely, were found to have better health outcomes than those who were exposed to light from phones, TVs, nightlights, etc., during the night.

Now, it is important to note that this study design is one of correlation (albeit with robust design and control of known confounding variables), and not necessarily causation, though the study authors explain that more research is needed here to understand this link more directly.