A mattress is typically a large, usually square shaped pad for supporting an adult laying on his or her back, with the mattress sitting on top. Typically, it is intended to only be used as a primary bed, or as a base pad on a guest bed, rather than being used for sleeping. This bed arrangement is most common in children’s bedrooms. Some adults may also choose not to have a mattress in their bedroom for one reason or another. Mattresses are constructed from a number of materials, but typically consist of either memory foam or polyester/cotton blends with a layer of liquid, or air-filled bladders between the two layers…