Depends on when you have to be awake, but I feel I get up alot easier and quicker with my window open, or partially open, and curtains that don't completely block out the light. During summer, I am able to get up at 6-7 if only because it's a bit chilly
During winter, I just leave a little window open, and put my clock halfway across the room, like alot of other people here.
this might not be an option if you live in a city though, can't comment on that.