I know the quiet pools you can use 24/7, but I'm not sure about the theme pools. You may be asked to leave if you get too rowdy though, as the quiet pools can be very close to guest rooms. I know they do post the lifeguard hours at the theme pools, and people have posted that they swam without lifeguards there. I've usually requested rooms away from the theme pools, so I've never observed them really early in the morning to see if anyone is still there.