My lo is 4 months old. He can sleep on his own for all afternoon naps (2x) for 1 to 2 hours. Just leave him on the bed with pacifier and a bolster he is gone after a few minutes. Only in the night, he needs to be carried (good day 15 mins) (bad day 30 mins and above). Why is this so? How can I train him to sleep on his own in the night? Good thing about him, he can now sleep through the night till 7- 8am. Bad thing about him, I need to wake up 2-3 times just to flip him facing up because he can't flip himself back or either diaper change. After that he will just fall back to sleep on his own.