I sleep trained my almost 6 month old baby about 3 weeks ago. Things were going fine. He was sleeping from about 730-8pm until 630-7am. Well here the last couple of days he has woken up anywhere between 4am-530am and will not go back to sleep. This morning I tried going in changing his diaper and giving him a bottle around 5am. I laid him back down and it looked like he was going to go back to sleep only to get right back upset and refuse to go to sleep. So here we are up before 6am and he's been up since around 4am. Any tips or ideas??