On his back or side, and ALLLL over our bed. He starts out sleeping peacefully on his side, rolled into me with his head tucked into my chest or armpit like a little angel. However, he inevitably ends up flat on his back, and spread across the bed between John and me with his head jammed into John's back and his feet up on my belly. If you've ever seen those hilarious illustrations of crazy baby co-sleeping positions that float around on Facebook -- uh yeah, every night in our bed is a "H is for Hell" night!