Person working when others sleep

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
nightbird \nightbird\ n. A person who likes to be active late at night; a night owl . Syn: night owl, nighthawk.

Wiktionary Word definitions in Wiktionary
n. (context idiomatic English) One who stays up late at night or goes to bed late.

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ But I also wondered what I was supposed to do about a lifelong way of living as a night owl . ▪ If you are a night owl this really is the place to come to.

Wikipedia Word definitions in Wikipedia
Night Owl is a 1979 album by Gerry Rafferty . It was released a year after Rafferty's Platinum-selling album City to City . While not quite performing as well as its predecessor, Night Owl still managed enough sales to achieve Gold status in North America ...