Our top pick, West Elm’s Shelter Sleeper Sofa, exemplifies this blend of form and function—and it’s an ideal size for most people ... ll need for it when the bed is fully extended out.” ...

Sleeper sofas come in a range of sizes, from loveseats or chairs-and-a-half that convert into twin-sized beds and full-sized sofas that contain queen- or ... a roughly king-size mattress.