This situation is brought on by necessity. In
normalNormal saline flush circumstances it would never be recommended to make this transition at such a young age. It's almost to be expected that you may encounter some problem, and all you can really do is set very firm limits and pursue them. The problem with what's happening is that you are facing your son with a situation that is not appropriate to his stage of development. But, it's a less-than-perfect world and you're doing what you are forced by necessity to do.
You can be sure he'll get out of bed during the night, but hopefully won't get out of the room.