I like it! Entrepreneur Magazine has an article about changing your work day, and I think it’s a great idea. I’ve done similar most of my entrepreneurial career, especially during the summers when it is nice to take an afternoon motorcycle ride.
Of course, starting work at 5am may be a difficult transition, but think about what you do at night. Is it time spend on valuable tasks, or binge watching TV shows while you sit on the couch and eat food you know you should not be eating? I can see many advantages of this type of work schedule.