Update, week 6 and he's still with us!
He states he doesn't want to sleep in his room "because the wind and fan make a loud noise". There's no fan in his room and we used to run a humidifier so that he wouldn't hear wind and other background noise. We've tried a couple of the suggestions here with no luck as of yet. I'm thinking about having him sleep in a sleeping bag on the floor rather then in our bed and maybe he'll want to go back to his room. Although there's nothing more precious than when we're both trying to go to sleep and he leans over and kisses me and says I love you mom! Or seeing him sleep peacefully.