I set my alarm 5 minutes before I actually want to wake up. When it rings the first time, I consume a large glass of fake lemonade (the kind with lots and lots of sugar). Perhaps not healthy, but it works - among other things, the presence of sugar in the mouth immediately releases dopamine. On the few occasions the energy isn't enough, the urge to use the bathroom is ;)

I tried the coffee thing, for me, sugar works more reliably.