Answer:
I fill a room but take no space.
*forward* *backwards*is what I do all day. I come in all different shapes and sizes. I can be scary and I can calm you down.
I am asleep when you are awake I am awake when you fall asleep. I can fly but no feathers to aid my flight.
My tail is long, my coat is brown. I like the country, I like the town. I can live in a house or live in a shed, and I come out to play when you are in bed. What am I?
I go up but never come down. What am I?
No matter how little or how much you use me, you change me every month.