Answer:
What do you call a sleeping bull?
I belong to you but others use me more often than you do
I'm not a bird, but I can fly through the sky. I'm not a river, but I'm full of water. What am I?
What gets bigger the more you take away?
What has no beginning, end, or middle?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.