My 10 week old baby will only sleep on me or in a sling for naps, and cosleeping at night. However, I would like to change this and in particular go to sleep at night in his crib/alone so that I don't have to go to bed at the same time. At the moment he wakes if I dare leave the bed...any tips so that I can break this habit now and not have to resort to controlled crying in several months time?!