A night shift is either a group of workers who work during the night, or the period in which they work. See shift work.
Night Shift (with capital initial letters) refers to: Night Shift, a 1978 collection of short stories by Stephen King Night Shift, a 1982 film, one of Ron Howard's earliest directorial efforts Night Shift, an Atari video game Night Shift, a Serbian heavy rock band Night Shift, a British television series shown late at night on ITV Night Shift, a fictional team of supervillains in the Marvel universe.