A bed can be referred as a piece of furniture which is used as a place to fall asleep and relax. In this modern age beds consist of a soft cushioned mattress and a bed frame, the mattress is usually resting on a sprung base, solid base, or a wood slats. Beds come in different sizes ranging from infant-sized cribs to small beds that can just accommodate one person, to large king and queen sized beds designed for two or more people. Most bed are usually a single mattress and a fixed frame, however there are other varieties such as a sofa bed, which folds out of a sofa or a murphy bed that folds in to a wall. Other beds can be referred as temporary beds as they contain neither a bedframe nor a mattress, a good example is the inflatable air mattress or the folding camp cot.