Daybeds have split personalities. They are dressed for use as a sofa by day but include a twin-size mattress for sleeping at night. Daybeds look at home in a family room or den as well as in a bedroom. A metal or wood frame may enclose three sides. Most often used to accommodate guests, daybeds sometimes conceal a pop-up frame or drawer trundle underneath that houses another mattress. These are great to use in a multi-purpose bedroom.