When Daniel sleeps in

Since we moved into the house, I haven't set the alarm once. Daniel has been quite faithful about getting me up by seven. In fact, I had to get curtains up in his room fast, because he was up with the sun - even on Saturday! Then he threw me. Tuesday, he didn't get up until ten to eight! So much for getting to work by eight... But more important, what did we do different Monday to get him to sleep in?!?!
--Misty