Give him a warm box, and once he starts to perk up, cwch him up on your lap. I remember one lamb, came in cold and flat, put him in a box by the rad, Baz tubed him, we also let another little lamb curl up with him, after a while we spotted a little head. Sat him on sofa with us, cat came and sat right by him, something quite therapeutic about the cat being about, after a while of of a little massage, n cajoling he got up. And never looked back. Just keep fluids going in, maybe a little glucose? And keep build that little flame up, good luck xxxx