Sofa beds are a versatile piece of furniture that can serve multiple functions, making them a popular choice for smaller living spaces. There are a variety of synonyms that can be used to describe sofa beds, including convertible sofas, sleeper sofas, pull-out sofas, and sofa sleepers. Each of these terms refers to the same type of furniture that can be used as both a sofa and a bed. Other related terms might include futons, daybeds, and chaise lounges, which can all serve a similar function as the traditional sofa bed. No matter which name you use, sofa beds are a useful and practical addition to any home.