A.G.
Go into the spare bedroom this evening and move what you can without telling him, "I am going into the spare room to move some stuff." While in there, holler, "Honey, can you come here for a second?" He will get up from wherever he is and come see what you need. Then, he will be trapped and you can ask him to move the mirror and whatever else is in the way.
Then you can tell him that HE can sleep there!! Good luck to you. Mama needs her sleep!!!