Just Plain Tired

This is going to be really quick. I was called in to work today, and ended up working for eight and a half hours instead of four and a half hours. I know, I need the money and I should be grateful...but I'm not used to working for eight hours almost every day anymore, and not only am I dead tired, but my knee hurts like hell. Doesn't help that work was busy for most of the day, too, probably because it's the beginning of the month and people are still using food stamps and social security checks...and if it's not that, they're buying their first "school-night dinner" orders since June.