When will it end???

Liam will NOT sleep through the night. He was doing great for a while, but apparently that was just a tease. He wakes up every morning between 3-4am, drinks a bottle, then he fakes going back to sleep. When I think he's asleep, I try to put him back in his crib, then he wakes up and starts crying. We play this game a couple times in the night until he really is asleep. Lastnight, he started to cry, but I decided to leave him alone, and he fell right asleep. Yeah! But how do I get him to stop this 3am stuff??? It is really starting to make me tired!