Bird-Related Idiom for Someone Who Stays Up Late

This page is the CodyCross answer for the clue below from Working From Home, Group 1222, Puzzle 5 (Happy Employee).

Question is: Bird-Related Idiom for Someone Who Stays Up Late

and the answer is: NIGHTOWL

Word Meaning:

NIGHT OWL — (literally) An owl (order Strigiformes) that is nocturnal.

Definitions from Wiktionary.