Are you a girl or a boy..?
Cause if ur a girl, there could be more than one reason, but if you're a boy (I don't think so last time I heard from you) than it could be a stomach bug.
OR you ate something bad the night before.
I don't know, but ask your parents or sibling.
I've had a couple of times where I couldn't sleep ALL NIGHT because of.. A stomach bug. I'm a girl, btw.
Idk if you know what I mean, but yeah.