A clothing dream

Here's what I'd like: a blanket with sleeves. Do such things exist? I enjoy reading in bed and on the sofa, and I always go beneath the covers to do so, but the top part of my body is exposed, and I get cold. Ideally I'd like to stay beneath the covers, but then it's hard to hold my book. So I thought, why not a blanket with sleeves? It would sort of be like wearing your jacket backwards, the blanket would rest on top and your arms could stick out and hold on to your book while you stay snug underneath. It'd be just the thing for a cold drafty San Francisco apartment, don't you think?