Put your alarm clock as far away from you as you can while still hearing it, this way you have to get out of bed to turn it off. Once your up, then it's just the will power game to stay up the 5-10 minutes it takes for being awake to kick in.
Also, you can try going to bed early, or having some kind of energy boost, like coffee, ready for you when you wake up.
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In the words of Einstein
"And now I think I'll take a bath"