FIG. 1 is a front perspective view of the double-decker bed; FIG. 2 is a top plan view of the double-decker bed; FIG. 3 is a front and in reverse back elevational view of the double-decker bed; FIG. 4 is a left and in reverse right side elevatonal view of the double-decker bed; and, FIG. 5 is a bottom view of the double-decker bed.