My son is 23 months old and has always been a great napper/sleeper. From about 4 months until the last few weeks, he has always put himself to sleep. All of a sudden, he is refusing his naps and bedtime. He is so tired, he falls asleep standing up with his head on his lovey, resting on the crib rail. I have tried letting him CIO ( for 1 min all the way up to 20 min intervals) before having to go in and lay him back down. I don't see any signs of molars and there is no illness. I am just curious if anyone has had this same issue with their almost 2 year old? He will go as long as an hour fighting before falling asleep for about an hour. Any suggestions on how to help him go back to self soothing?