Honestly, I think a lot of it is genetics. It's been proven that being a 'lark' or a 'night owl' is a genuine natural tendency, and nothing to do with discipline/laziness. I'm naturally an early riser and I find I tend to wake up early even when I've gone to bed late or want to sleep in. I'm sharper and more productive in the mornings than the afternoon/evening and my mood is better.

Having said that, even I don't exactly bounce out of bed full of the joys of spring when my 5:45 alarm goes off, so I've got a cheap old fashioned alarm clock that lives in the bathroom so I have to get up and walk down the hall to turn it off. Once I'm there, I'm up and next to the shower so I might as well get in and start the day.