The size of the sofa is queen but the size of the bed is only single

I love this small sofa bed. When purchased, I'd found a Smith & Wesson Western wall art picture with a green background for the room, and the green couch from Wayfair was centered around that particular picture. It's beautiful. Perfect for a Texas home. Occasionally, one of my sons stays overnight, and with the sofa bed in a third bedroom that I set up as a den, he has his own bedroom, using the sofa bed for sleeping, and during the day, the room is easily returned to a relaxing TV room for him. The sofa bed with the twin size mattress is perfect for the small third bedroom along with a recliner, a wicker coffee table (purchased from Wayfair), end tables, and a TV stand. It's a beautiful yet masculine room mainly because of the green upholstered sofa bed. I've purchased so many items from Wayfair over fifteen years, and love them all. Schay