Sofa Beds are a type of sofa which can be used in their normal state as a daytime sofa, or can be folded out into a bed.
Sofa beds differ from futons in that their primary use is a sofa, which has an underneath section which makes the bed. A Futon is a folding structure which can be completely flattened into a bed.
On some Sofa Beds, the 'sofa' part of the bed, namely the arms and back, will remain whilst in the bed position. However, other sofa beds will be more similar to a futon in that they fold down flat.
Underneath the seating cushions, there will be a folded metal frame and thin mattress, which can be folded out and be used as a bed.
Sofa Beds come in the following sizes: