I claim the ornamental design for a counterweight pillow sling sleeping aid, as shown and described.
FIG. 1 is a top perspective view of the inner side of the counterweight pillow sling sleeping aid;
FIG. 2 is a bottom side perspective view of the outer side of the counterweight pillow sling sleeping aid shown in FIG. 1;
FIG. 3 is a top plan view of the counterweight pillow sling sleeping aid shown in FIG. 1;
FIG. 4 is a bottom plan view of the counterweight pillow sling sleeping aid shown in FIG. 1;
FIG. 5 is an elevation view of the back of the counterweight pillow sling sleeping aid shown in FIG. 1;
FIG. 6 is an elevation view of the front of the counterweight pillow sling sleeping aid shown in FIG. 1;
FIG. 7 is a side view of the outside of the counterweight pillow sling sleeping aid shown in FIG. 1;
FIG. 8 is the side view of the inside of the counterweight pillow sling sleeping aid shown in FIG. 1; and,
FIG. 9 is an illustration of the counterweight pillow sling sleeping aid shown in FIG. 1 in its environment of use on a person in a sedentary position.
The broken lines showing a person in a sedentary position in FIG. 9 depict environmental matter and form no part of the claimed design.