I know there are a lot of people who are very successful in those late quiet hours, rather than the early morning quiet hours. Tim Ferriss is a key person who comes to mind. However, the point I'm trying to make here is that in the case of the early morning risers, I find they are much more consistently doing incredible work in their lives.

To observe that early risers are consistently successful, it doesn't mean that late night workers aren't successful. I've just found anecdotally that if you were to take a sample of early risers vs late night workers, the first group seems to have a higher percentage of successful people.