Article: Light at night linked to symptoms of depression in mice.

Too much light at night can lead to symptoms of depression, according to a new study in mice.

Researchers found that mice housed in a lighted room 24 hours a day exhibited more depressive symptoms than did similar mice that had a normal light-dark cycle.

However, mice that lived in constant light, but could escape into a dark, opaque tube when they wanted showed less evidence of depressive symptoms than did mice that had 24-hour light, but only a clear tube in their housing.

"The ability to escape light seemed to quell the depressive effects," said Laura Fonken, lead author of the study and a graduate student in psychology at Ohio State ...

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