A new study of animals suggests that constant exposure to light at night can cause depression. In the study, hamsters that were exposed to dim light at night for four weeks showed signs of depression (such as not being interested in treats they usually enjoyed), compared to animals who were not exposed to light at night.
The researchers theorize that exposure to artificial light at night might have contributed to the rising rates of depression over the past 50 years. There's good news, though - the researchers found that the negative effects of light at night were reversed in the animals after just two weeks of normal lighting conditions.
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