I once read that you need to be careful selecting a mattress. Example, you don't want a 'Home' mattress laying on the floor in your stick house because they are designed to be on a Box Spring, that allows ventilation. This is necessary to 'dry out' the mattress. (You wouldn't believe how much one sweats at night). I'm not sure how valid that is, but I would be cautious of throwing just anything down, that was not tested and good. You don't want to start sleeping on something that might get moldy.