I'm a big fan of the benefits of rising early, even if I'm not the greatest practitioner. Truthfully I think that "early rising" is a relative term - if you already get up at 5am every day, what are you suposed to do, get up at 4 now? But anyway, you're not just adding a little extra time to your day, you're starting your day in a whole different mindset. I read someplace once that when you wake up, the first thing you should do is turn around and make the bed. It gives you a task to focus on, it prevents you from climbing back under the sheets, and you start the day by accomplishing something. Does not work if you have a spouse that doesn't get up when you do :).
Bonus points to the above article, by the way, for quoting the Dalai Lama on the first point.