We are lucky enough to have a study, so we have an Ikea sofa bed in there. Beddinge (new model is Karlaby). I like it because it has plenty of support, and because it's long & wide enough for a person to lie on without opening it right out. We also have a single foam mattress that lives behind the sofa bed which does most of the kid sleepover events, we could fit another down there if we needed to.