Meaning of "Night watch"

Bul-Chim-Beon

Night watch불침번#직장/비즈니스#판교어#사회/이슈#라이프스타일Ancient Meme

To prevent incidents within the unit during sleeping hours, soldiers take turns standing guard without sleeping

"Since we had night watch duty starting at 10 a.m. today, our team took turns standing guard before going to bed."