Awake at Night Like an Owl
This page is the CodyCross answer for the clue below from Physics, Group 1887, Puzzle 5 (Particle Accelerator).
Question is: Awake at Night Like an Owl
and the answer is: NOCTURNAL
Word Meaning:
NOCTURNAL — (of a person, creature, group, or species) Primarily active during the night.
Definitions from Wiktionary.