I love training early morning. The roads and trails are much less crowded, and when I do, I feel like I have much more energy the rest of the day. We used to have hockey practice at 6am every morning, and I really looked forward to it.
Plus, there's something really satisfying going to work/school/whatever first thing in the morning and knowing you've already done more that day than most of the rest of the people will do the remainder of the day.
I don't do so much early morning stuff these days though. When I get up, it wakes our dogs up, and they wake everyone else in the house up. Then I get yelled at...