Tearing the tissues piece by piece

Right now, my kid is not taking a nap like his usual work every day. Though he is not jumping, running around, and not bothering but I am so annoyed with what he is doing. Guess what! He has a tissue and he tears it piece by piece on his bed. Sigh! Anyway, hope that he will take his nap in a while so that I can remove the pieces of tissues on his bed.