Light therapy is often as effective as antidepressants for seasonal affective disorder (SAD)

Light therapy is often as effective as antidepressants for seasonal affective disorder (SAD).

Shorter days and reduced light trigger winter depression in some people. It's thought to be caused by increased melatonin... or reduced levels of serotonin or other neurotransmitters. 

It's more common in women...and in northern latitudes.

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