questionshow do you beat "winter depression"?

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It beats me. Then I console myself with a fuzzy blanket and a nap.

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A couple of full-spectrum lightbulbs in the overhead light fixtures.

They're cheap -- ~$1-2 per bulb for incandescents, and there are full spectrum CFLs now also. The effect may be psychosomatic, but it works for me.

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Carbs. Lots of carbs. Preferably in the form of HaagenDazs bananas foster ice cream, and Reese's cups miniatures. For me, the miniatures have the optimal peanut butter:chocolate (ratio).
Also lots of Chai tea.