For most of history, humans rose with the sun and slept when it set. Enter Thomas Edison, 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.
URL: http://www.topix.com/health/depression/2012/11/risk-of-depression-learning-issues-when-a-person-is-exposed-to-light-at-night?fromrss=1
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