How to fall asleep when I'm not tired?

So it is exactly 4:30 and I have to be up at 10:30 for my friends swim meet! But I am not able to fall asleep and I know if I pull an all nighter I will fall asleep at her swim meet. I am 13 so I am not going to take drugs or anything to fall asleep. Or tea.. mostly cause I hate tea. Any other advice?