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Summer Weather

Seasonal affective disorder (SAD) is most commonly associated with winter blues, and it afflicts about 5% of Americans.

But for less than 1% of those people, this form of depression strikes in the summer. Warm weather depression arises when the body experiences a "delay adjusting to new seasons," says Alfred Lewy, MD, professor of psychiatry at Oregon Health and Science University, in Portland.

Instead of waking and enjoying dawn, the body has a hard time adjusting, he says, which could be due to imbalances in brain chemistry and the hormone melatonin.

(Getty Images)

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