How to wake up early
It made me
more productive 
"Reward you in a way which is meaningful to you"
How I did it: I did not actually aim for this goal, but it came as a lucky side-effect of another decision.
I joined the 24h real-time strategy game "Travian". Very soon I noticed that the game gives advantage to playing in unusual times. (I suppose that most of 24h real-time strategy games have a similar feature.)
Now I have no problem getting up early. I am now more productive at work, and in addition, I get satisfaction of robbing my opponents of their nightly production when they are still asleep. :)
Resources: Travian (www.travian.com), you should select a local server or at least one that operates on your time zone.
