What's the size of a sofa bed?
Usually the size of the folding sofa is 1.2*0.6*0.8m, and this size is similar to the size of a double sofa. If you let go, it's a double bed size, about 2.4*1.8. This size is enough for two people to rest on it, and very spacious.
The size of a folding sofa is smaller than a regular one, but it becomes a bed if it is released.