I find the dark, dank days in the Pacific Northwest absolutely drain me of all energy. I had the full spectrum lights, and they definately help, but there's something about low light that leaves me exhausted.

I also find I can't sleep when storms are approaching, and I don't think it has much to do with low barometric pressure as some sort of electomagnetic type thing. It happens with full moon, when it's windy, rainy and foggy.