In many instances, a sofa is the focal point of a room. Depending on the type of sofa you choose, it may provide a classic, formal feel or it may beckon people to take a seat in a more casual environment. While a sofa contributes greatly to the look of a room and it provides seating, some sofas can do even more. Sleeper sofas, for example, can provide an extra place for guests to lay their heads when they stay at your home.