Answer:
In the evening I'm long, in the morning I'm smallΝΎ When seen in a ballroom, I'm nothing at all.
You can tumble in it, roll in it, burn it, animal eat it. Used to cover floors, still used beyond stall doors. Freshens whatever it is placed on. Absorbs whatever is poured into it.
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.
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.
I'm not man's best friend, I'm their enemy, I can mark your end, yet you do not see me, I am very small, but very tough, If you have me, then you have it rough.
You use it between your head and your toes, the more it works the thinner it grows.