When friends or relatives call and you need beds to put everyone up for the night, inflatable mattresses can offer a great alternative to lugging heavy old mattresses up from the basement. Deflated, air mattresses take up very little room and can easily stow in a closet. Plug them in and in less than five minutes you can have a lovely queen-size mattress ready for sheets and blankets. If you’ve already started to look for an inflatable queen, you’ve probably already run into a bevy of choices. To help you find the right mattress for a great night’s sleep, here are a few key considerations to mull over before you buy.