Awesome stuff! I'll need to go through it in more detail before I write my article, but mood definitely seems to affect most of us, though in drastically different ways. Some people can even write in a bad mood; how's that for miraculous! ;) (I can write in a bad mood... it's just that my characters all end up being tortured! Ha!)
There was something else I realized about myself today. I woke up on the wrong side of the bed (it's been a long week -- I think I mentioned that -- and I've gotten just a little sleep), and stayed there right until my PT meeting. Once I'd been out and about, though, I perked right up! I was even able to sit and write in the PT, while my shoulder had a heating pad and later while it was being iced. I generally can't write when everyone around me is busy, so that was a really good sign for my abilities today!
But I realized that, really, it was the getting OUT that did it for me. This isn't always true; sometimes I roll out of bed and write right away. But occasionally, when I haven't had enough sleep, the trick is really to get outside. Run an errand, go buy coffee, go jogging -- it doesn't seem to matter, it's just getting up. Otherwise I stare at the walls all day, feeling morose and down with myself.
When you aren't in a mood to write, what improves it for you? What tricks have you leaned? :D