D.P.
I have a 5 year old that has always been a bad sleeper...For a while I just put a sleeping bag on the floor and told her to come in when ever she wanted, but not to wake me up. My first thought is that he is scared to sleep downstairs or sub conconsiously feels left out. Can the 2 kids share rooms?? put a mattress on the floor, bring his bedding up and then tell him he can stay there as long as he stays put. My daughter comes in randomly now and says she is scared of something (being alone in a room can be scary when you are little, especially being alone downstairs)...she also mentions that she just doesnt like sleeping a lone (sees me and daddy sleeping together and doesnt think it is fair)...