I co-slept in hospital with number one in hospital, purely because i fell asleep holding her. It was a single bed with no sides. That's when I knew I had an instinct and would be fine sleeping with her in a King size!! No one said anything. I still think back (10 years ago) and I had never heard of co - sleeping (no belly belly then), but to me it was the best choice for us, as she wasn't sleeping in the hospital, neither was I.
Now it may be different with policies, but really, they are dealing with women who have just given birth, If they tried to disturb my sleeping baby, whereever it was sleeping, they'd better be prepared!!!!