We have the same problem with our 2 year old we put him to bed at 8 he doesn't sleep untill 9 sometimes 10 latest when he does go down he wakes up at 1.30 sometimes 2 and doesn't go down sometimes till 4/4.30 we have also tried being firm but it didn't work, so now we have decided to just pick him up and bring him into our bed its really hard but we don't know what else to do and we both work from 9 so sometimes we are going to work with little sleep lately we have had to resort to some soothing music from youtube maybe try that. Hope it helps