Oh gosh, yes indeed. Sometimes can't explain it. Could be hormones, could be bad weather, could be nothing. I *try* to get some sunlight and move around some. It seems to help me. Years ago before Seasonal Affective Disease became popular, or at least known about, and there weren't light boxes to help, I found myself drawn to the lighting department at the Lowe's near my job. I would spend my lunch hour standing there in all that light and it made me feel better. As my grandma used to say "Go Know". Anyway, those blues could be anything but light and movement even walking, can't hurt.