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.
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.