Keelan, it's time to get up. You have school today!
Come on, son. It's time to get up!
No, really, now you're going to be late... ok, I give up.
Yes, my son has a Hello Kitty sheet on his bed. He has an odd size mattress and only one sheet that fits it (because I'm too cheap to buy more) so in between I use one of Coralie's twin flat sheets and tuck in the extra.