Answer:
I'm not a bird but I can fly through the sky. I'm not a river but I'm full of water.
Sometimes I annoy you, sometimes you can't live without me. But no matter how hard you try, you can't destroy me. What am I?
You write on me and secrets I can keep in places never seen. I spin like a top. Though stiff as a board, I'm often described like a mop. What am I?
I am the outstretched fingers that seize and hold the wind. Wisdom flows from me in other hands. Upon me are sweet dreams dreamt my merest touch brings laughter.
The more you have me the less you see. Shine a light on me and I shall flee.
No matter how little or how much you use me, you change me every month.