is there room to move his bed away from yours- the wall opp maybe?
that helped with us. I amped her up to her big girl bed ( other side of the room) and didn't get in it. I sat down beside. I would put my head on the bed and " fake sleep".
now she is in a room with her brothers. she loves it, but often wakes at 3ish and comes grizzling into my bed. I figure that's ok, she starts in her bed no problem