You don't have to press anything! Just Fullscreen if you can't see and enjoy!
I will say THIS IS WHAT WORKS FOR ME everyone is different so if majority of these things don't work for you i'm sure your parent// guardian would have some ideas for you. Another thing to do would be ask your doctor! Believe it or not they can also help you in sleep! (Plus they probably have better suggestions that a middle school Scratcher XD)