Folding sofa bed

FIG. 1 is a front, top perspective view of a folding sofa bed, showing my new design;

FIG. 2 is a rear, bottom perspective view thereof;

FIG. 3 is a front, bottom perspective view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side view thereof, the right side view being a mirror image of FIG. 6 ;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof;

FIG. 9 is a front, top perspective view of the folding sofa bed partially extended; and,

FIG. 10 is a front, top perspective view of the folding sofa bed fully extended.

The dashed broken lines in the figures are for the purposes of illustrating portions of the folding sofa bed, which form no part of the claimed design.