Does he use a dummy? I did the same as a couple of the other girls. I used to go into his room just before he was due to come out of a cycle and in my case, I'd put his dummy back in. It seemed to do the trick and off he'd go again. DS has always only used his dummy at sleep time. He's 17 months old now, he's a great sleeper but I know that if I go into his room at 5am and pop his dummy back in that he will more than likely sleep until 8am instead of 7am.