My DS is 4 months old and for the last three weeks has been sleeping really poorly. He goes down to sleep between 6 and 7 in his cot and sleeps until between 11&1, when he wakes for a feed. He must be hungry, as he usually takes around 6oz. He then wakes between 3&4 and lies in his cot babbling and shouting. He isn't wet, doesn't have wind and refuses milk. I have tried letting him lie there and babble, but he works himself up into shouting and then eventually crying. He seems totally unable to go back to sleep. The only thing that seems to work is taking him into my bed. I have tried settling him for nearly an hour, before taking him in with me. Sometimes, he won't go back to sleep in my bed either. I don't think he can't settle himself, as he obviously does that earlier in the night. I'm shattered and desperate for a decent sleep. Does anyone have any tips on how to get DS back to sleep?