For most of history, humans rose with the sun and slept when it set. But today, with a flick of a switch, night becomes day, enabling us to work, play and post cat and kid photos on Facebook into the wee hours. However, according to a new study led by Johns Hopkins biologist Samer Hattar, when people routinely burn the midnight oil, they risk suffering depression and learning issues. The culprit? Exposure to bright light at night from lamps, computers and even iPads.
credit: The John Hopkins University