graveyard shift

English Thesaurus

1. workers who work during the night (as midnight to 8 a.m.) (noun.group)

hypernym	:	shift,
definition	:	a crew of workers who work for a specific period of time (noun.group)

2. the work shift during the night (as midnight to 8 a.m.) (noun.time)

hypernym	:	duty period, shift, work shift,
definition	:	the time period during which you are at work (noun.time)