I have a 14 month old boy. Up until he was 1 he went to bed every night no problem. At 7.30pm he went into his cot awake and went to sleep on his own, he would wake at 4 or 5 and come into us. Now when we put him in his cot he screams the house down. When he finally sleeps he only stays asleep for 2 or 3 hours and then the screaming starts again. I am at a complete loss as to why he has changed so much regarding bed time. Any suggestions?