While not conclusive, it would appear that light and subsequent circadian disruption may increase chances of things such as breast cancer. https://www.ncbi.nlm.

While not conclusive, it would appear that light and subsequent circadian disruption may increase chances of things such as breast cancer. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3002207/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3002207/ From an evolutionary biology standpoint, I would expect being able to sleep through light and noise a negative for survival.