One rude way to force yourself to get up... make sure your alarm is at the farthest corner of your room from where you sleep. The point is to have to get up and walk a little before you shut that alarm.

Trust me, it's extremely irritating, but for me personally, once I'm up and moving I manage to not get back in bed.

Another thing, try to go to bed as early as possible, even if it means not pissing away time on the internet. The longer you sleep, the less tired you feel in the morning, which means the easier it is to wake up.