DS has always slept on his tummy. He now seems to roll on to his back and wake himself up. What can I do about this? Do I just need to get tough and teach him to sleep on his back? I've been doing CC tonight and the problem is that if/when he falls asleep it'll probably be on his back and I'm worried that he won't stay asleep that way. Should I sneak back in and put him on his front? 