I did it with my son for about two months after he was born. He was a TERRIBLE sleeper and this was the only way i could get him to get any sleep at all! As for worrying about rolling on him... i am a very light sleeper and would wake everytime he stirred. And you are So aware of them being in the bed i don't think you could roll on them unless you had been drinking or something. I found it a benifit also in that it helps me bond with him too.
DS 21/8/04 DD 18/9/06