I like your idea. There are a few things that would have made your composition a bit stronger, the PJs lose center stage here because of the huge book covering them. Having the kids lay on their tummies with a vertical comp might have been better to show them. Your lighting is kinda flat. Meaning there is no difference between light and dark areas so your image lost depth. Focus is just a hair soft, try a bigger f-stop. Cute kids though and, like I said, a good idea.
Like the angle with their little toes out front. I might have tried pinning the comforter partway up the wall so this felt even more cozy. The wall is a bit stark.