crabby day

do you ever have a crabby day for no specific reason? nothing really happened today to make me crabby. in fact, it was a pretty laid-back day in general. it mostly involved cleaning, grading, and watching tv. nothing to complain about. and yet, i'm in a mood. maybe it's a sign that i have too much on my mind. or that i'm worried about money, as seems to be a constant. or could be just missing people. hard to tell. whatever the deal is, i think i'm going to eat a snack, finish my graduation announcements, and go to bed.