A collapsible bed is a type of furniture that can be easily folded up and stored away when not in use. It is often used in small spaces, such as apartments or dorm rooms, where space is limited. Common types of collapsible beds include cots and futons. A COT is a small, portable bed that is usually made of metal or canvas and can be folded up for storage. A FUTON is a Japanese-style bed that consists of a mattress on a frame that can be folded up into a couch.