So not just a twenty-dollar word for "nocturnal," though it can be used for that as well. Most traditional vampires are lucifuguous. Borrowed in the 1650s from Latin lucifugus, from lux, light + fugere, to flee + adjectival ending. Think a fugitive from light, if that helps.
I flicked on the kitchen light and stopped in shock as lucifuguous cockroaches scrambled under the counters.