Convertible Sofa Bed

A convertible sofa bed comprising:

• a U-shaped section having a first arm, a second arm, and a back section between, and joined to, the first arm and the second arm;
• the first arm has a face distal to the back section, the face having a top edge;
• the second arm has a face distal to the back section, the face having a top edge;
• a first end section has a front edge, an internal bottom edge, and an internal top edge;
• the front edge of the first end section is rotatably joined to the top edge of the face of the first arm;
• a second end section has a front edge and a bottom edge;
• the front edge of the second end section is rotatably joined to the top edge of the face of the second arm;
• the internal top edge of the first end section has a first portion of a first closure element and the internal top edge of the second end section has a first portion of a second closure element;
• and
• a mattress comprising:
• a first mattress section, a second mattress section, and a third mattress section;
• and
• the first mattress section is rotatably joined to the second mattress section, and the second mattress section is rotatably joined to the third mattress section;
• the third mattress section has a first bottom edge and an opposing second bottom edge;
• the first bottom edge of the third mattress section is joined to the bottom edge of the first end section, and the second bottom edge of the third mattress section is joined to the bottom edge of the second end section;
• the first mattress section has an internal first edge and an opposing internal section edge;
• the internal first edge has a second portion of the first closure element, and the internal second edge has a second portion of the second closure element;
• the first closure element releasably joins the first end section and the first mattress section, and the second closure element releasably joins the second end section and the first mattress section.