my 2 year old son doesn't want to sleep at night

he's doing this because you have not put your foot down about bedtime. putting him on the sofa with a cup of milk, and allowing him to sneak in your bed is not solving your problem, it's only making it worse. when he gets out of bed, take him back quietly, and tell him, "get back in your bed. you need to stay here and go to sleep. it's bedtime." and leave it at that. walk out of the room. if you are still having issues with him getting up and walking around, put a gate on his door so he can't leave his room. my 21month old daughter has one in front of hers for similar reasons. let him cry it out. if you don't get a handle on this now, the older he gets, the harder it's going to be. and just imagine dealing with this on top of a newborn. yikes! hope this helps. don't let him turn bedtime into a powerstruggle. it's a vicious cycle.