The ornamental design for a sleeperwindowaccentpanel, as shown and described.
FIG. 1 is a perspective view of a sleeper window accent panel showing a first embodiment of our new design in the environment of a vehicle;
FIG. 2 is a front perspective view of the sleeper window accent panel shown in FIG. 1;
FIG. 3 is a front view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is a left side view thereof; and
FIG. 6 is a right side view thereof;
FIG. 7 is a perspective view of a sleeper window accent panel showing a second embodiment of our new design in the environment of a vehicle; which is a mirror image of the sleeper window accent panel shown in FIGS. 1-6;
FIG. 8 is a front perspective view of the sleeper window accent panel shown in FIG. 7;
FIG. 9 is a front view thereof;
FIG. 10 is a top view thereof;
FIG. 11 is a right side view thereof; and,
FIG. 12 is a left side view thereof.
The broken lines shown in FIG. 1 and FIG. 7, illustrate environmental subject matter that forms no part of the claimed design.