lucubrate (v.) Look up lucubrate at Dictionary.com
1620s, "to work at night," from Latin lucubratus, past participle of lucubrare "work at night, work by lamplight," from the stem of lucere "to shine," from PIE *louk-eyo-, suffixed (iterative) form of root *leuk- "light, brightness." Hence "to write or study laboriously" (1804).