Like others have said, two days really isn't that bad.
However, if it does continue, just try to wear yourself out. It's possible you're just not tired anymore at 5a.m., so read a book, exercise, play a sport, or whatever. Can be mental or physical. If you're still waking up at odd hours/too early for the next two weeks or so, then it might be time to see a doctor and get their opinion.