Sofa Mattress

FIG. 1 is a front, left side, top perspective view of the sofa mattress in a first configuration, showing the new design;

FIG. 2 is a left side view thereof, the right side view (not provided) being a mirror image thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a right side view thereof in a second configuration; and,

FIG. 6 is a front, right side, top perspective view thereof in a third configuration.