Answer:
I sleep by day, I fly by night. I have no feathers to aid my flight. What am I?
People buy me to eat but never eat me. What am I?
I can be heard in a court or carried with you.
What goes through a door but never goes in and never comes out?
What has legs but doesn't walk?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.