The ornamental design for a carnightlight, as shown and described.
FIG. 1 is a perspective view of a car nightlight showing our new design;
FIG. 2 is a front plan view of the embodiment of FIG. 1;
FIG. 3 is a rear plan view of the embodiment of FIG. 1;
FIG. 4 is a left side plan view of the embodiment of FIG. 1;
FIG. 5 is a right side plan view of the embodiment of FIG. 1, the left side plan view being identical;
FIG. 6 is a top plan view of the embodiment of FIG. 1; and,
FIG. 7 is a bottom plan view of the embodiment of FIG. 1.
Surface shading is used to shade FIGS. 1-7 to show clearly the character and contour of all surfaces of the 3-dimensional aspects of the design and form a part of the design sought to be protected.