DO all sofa sleepers pulll out and turn into a bed?
possibly. Im not sure about all in the world though. most of them do.
Sleeper sofas mean just that. They pull out into a bed. Otherwise they wouldn't be called sleepers.
If it's called a 'sleeper sofa' or 'sofa bed' then yes, it pulls out into a bed. Or turns into a bed in some manner. Otherwise it would just be called a sofa.
