I think the pool guy was here this morning and my dog loves nothing more than to go out and bark at him.  Usually if I know he's going to be here I'll put in the doggy door, but I guess he came really early this morning while I was still sleeping.  Or trying to sleep because for some reason instead of going outside, my dog thought it would be a good idea to stay in bed and let out periodic barks.  This isn't a normal behavior for him, but it was especially annoying because I'd just be drifting back to sleep and then he'd bark again waking me back up.  I hope this isn't going to be his new "thing."