Sofa Bed

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

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is a top perspective view showing the sofa bed, in state of use; and,

FIG. 9 is a top perspective view showing the sofa bed, in another state of use.

All the broken lines in the drawings depict portions of the sofa bed that form no part of the claimed design.