It's the same with me when I'm depressed.....hygiene just goes out the window. I don't even brush my teeth on the weekends if I'm not going anywhere, or get dressed, or do anything but sit in front of the computer.

This winter's been different, but that's beside the point. Psych Central had a great article about this topic some time back; maybe it's in the archives and you can search there for it. I can't remember the title (sorry) but it was all about why we lose our ability/willingness to perform self-care, in this case bathing, during the down times.