I tell people i am solar powered because i am usually good if the sun is out, however, if it is not...watch out. I will either be in a downer mood or grumpy. It took me awhile to figure the pattern out and that had a direct correlation to the weather. I use a light box now and go to the tanning salon for 6 or 7 min if it is gray/raining more than 2 days in a row. That has helped me. Also, on a grander scale my worst depressions come in the late fall/winter. and my highest hypo comes in the spring/summer. While it is annoying as heck, it is kind of a cool thing to be so intimately linked with nature : ).