Like some of the reviews have said, the sofa is cute and chic but quite small. In order to transform it into a sleeper sofa, you would definitely need to buy two sofas and combine them. Even when buying just one piece, the sofa comes with a separate spare "lock part" for this very purpose. Apparently, it would be needed to connect two sofas to make one bigger sleeper sofa. Keep in mind, though, that even then, it would be a smaller sleeper sofa. 

But it is very cute and versatile! Overall we are very happy with our purchase.