Trundle beds are essentially daybeds with a hidden drawer underneath that pulls out to reveal an extra mattress. The pull-out bed is usually twin-size, but the main daybed can range from a twin to ...

This sofa bed does not have a metal frame. Instead, the back and bottom cushions are connected and fold out into a bed on the ground. Alex Temblador/Business Insider The Koala Sofa Bed is ...