I'm up and can't sleep

I feel all wound up for some reason, after falling asleep about 8:30 and sleeping till 11 something, and now it's almost 1:30 am and it's a no go. If I sit here and play on the Internet, I'll probably just keep being awake. I think I'll read for awhile. That usually makes me sleepy. The idea was to get up at 4:30 this morning and do some things around the house, and bake some bread. Maybe I'll do that now instead.