My lil dude used to wake up so happy, and just chill in his crib and chat, for last couple weeks he has woken up screaming, he even wakes up crying in the middle of the night sometimes again, most of the time he cries himself back to sleep in the middle of the night. He used to sleep 7:15-7, now he wont go to sleep until 9-10 and wakes up from 5:40-7, its driving me nuts and wish i knew why!