Exposure to dim light at night causes depression among hamsters and even humans, but the harmful effects of the lights could be reversed by simply returning to standard light and dark cycle.
URL: http://www.topix.com/health/depression/2012/07/harmful-effects-of-lights-can-be-reversed?fromrss=1
Enclosure: http://www.topix.com/bigpic/mini-4d57261b85285638047edcd503af84ba
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