noun
night watch; night watchman; sleepless vigil
Refers to staying awake all night to keep watch, or the person who does so. Often used in historical or traditional contexts, such as watching over a body before a funeral.
葬儀の前夜、親族が寝ずの番をした。
The night before the funeral, the relatives kept a sleepless vigil.
The castle's night watchman continued his lookout.