DS 3 has started waking up at 1 or 2 in the morning. he comes into our room and wants to get in with us. We have tried taking him back to his bed, but he gets out again and again unless we stay with him. it is cold at 2 in the morning, we are tired and it seems too hard to keep doing the back to bed routine. What's worse, for one of us to sleep with him in his bed or to let him into ours? will this phase pass.... please?