The ornamental design for a nightlight, as shown and described.
FIG. 1 is a perspective view showing the claimed design for a night light.
FIG. 2 is a front plan view of the claimed design for a night light.
FIG. 3 is a plan view of one side of a night light showing the claimed design for a night light.
FIG. 4 is a plan view of the other side of a night light showing the claimed design for a night light.
FIG. 5 is a top plan view showing the claimed design for a night light.
FIG. 6 is a bottom plan view showing the claimed design for a night light.
FIG. 7 is a rear plan view showing the claimed design for a night light; and,
FIG. 8 shows a detail view for a portion of the claimed design for a night light.
The portion of the night light shown in broken lines forms no part of the claimed design. It is understood that the pattern shown on the folded portion of the night light covers all surfaces of the folded portion even if the pattern is not shown on all surfaces of the folded portion of the night light.