C.S.
We often tell a child what they shouldn't do, I know I am guilty of this but maybe you can tell him what he can do to "get something". For example, if he stays in his own bed all night he gets a sticker..if he gets 5 stickers he gets a "prize", even if it's the $1.00 sundae at McDonalds. Or you make him a special treat. This may help put a positive spin on it that he will want to try.
Good luck...these crazy things really throw us for a loop at times dont they!