To me it would depend on how well they get along and how Walt and Jack do with it. Maybe you could go to bed an hour early, and lay in bed reading or something, just so you can be awake and see how they react? Jack may well guard the comforter or the entire area from Walt. Or Walt may guard. It's not possible to say until you try it, but you should be awake the first time so you can stop a fight before it starts.