Well that depends; did you shoot the footage during the day? If so you can use a day for night filter and a couple of masks that reveal the level of light originally recorded giving the impression that there are headlights. A useful tutorial can be found here: http://www.youtube.com/watch?v=0NlxcY-c69k
the day for night section starts about 50 seconds in.
If you filmed it in the dark you could add some optics for some fake light although it will be difficult to make it seem like it is reacting with its surroundings.
Hope this helped a bit,