A convertible seat assembly comprises a seat sub-assembly rotatably coupled to a substantially flat base member. The seat sub-assembly comprises a back member having a substantially flat first side and second side with a seat member coupled to the second side. The seat sub-assembly is rotatable between a sleeping configuration and a seating configuration. In the sleeping configuration, the substantially flat first side of the back member and the substantially flat base member form a substantially flat horizontal sleeping surface for at least one person. In the seating configuration, the seat member is deployed as a seating region for at least one person.