Well, I can certainly cross caffeine withdrawal off the 100% culprit list. It was probably a factor on Sunday, but I'm betting now it's weather-related. And perhaps some allergy issues?

Hm. I'll go take a Zyrtec now.

Oh, hey. So I looked out the back door when I got my pill, and it's all overcast. So, after yesterday's sunny-sunny-sunshine, yeah. It must be the change in the weather. *sigh*