The ornamental design for a night light, as shown and described.
FIG. 1 is a front perspective view of a night light;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a left elevational view thereof;
FIG. 4 is a top view thereof;
FIG. 5 is bottom view thereof; and,
FIG. 6 is a rear view thereof.
The broken lines shown on the drawings are for illustrative purposes only and form no part of the claimed design.