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Exposure to light at night may cause depression, learning issues, mouse study suggests

For most of history, humans rose with the sun and slept when it set. Enter Thomas Edison and colleagues, and with a flick of a switch, night became day, enabling us to work, play and post cat and kid photos on Facebook into the wee hours. According to a new study of mice, however, this typical 21st-century scenario may come at a serious cost: When people routinely burn the midnight oil, they risk suffering depression and learning issues, and not only because of lack of sleep. The culprit could also be exposure to bright light at night from lamps, computers and even iPads.
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