MJ has had a really hard time lately staying in his bed at night. I have a childproof doorknob protector on his door that physically keeps him in his room. He has since resorted to turning on his light and playing at 3:00 in the morning. That wouldn't be as big of a deal if he and RJ didn't share a room. After much consideration I deemed in necessary to tape his light switch down last night. It worked! It really ticked him off but it worked. Since he determined that he would not be sleeping in "mommy's bed" he found a suitable replacement.
Edited to say that this has become a common occurance. As long as it keeps MJ out of our bed and RJ isn't beating him up I have no problem with the sleeping arrangements.