I know people have said an air mattress will fit at Pop. Does anyone have any pictures? What do you do with it during the day and is it something you have to hide from mousekeeping? My DD, DGS (11), and DGS (12) are going with me in September. The youngest is ok with sleeping with his brother but the oldest wants no part of it.The way they fight, it seems an air mattress is the best solution.