n. phr. The work period lasting from sundown to sunup, when one has to work in the dark or by artificial light. "Why are you always so sleepy in class?" Professor Brown asked Sam. "Because I have to work the graveyard shift beside going to school," Sam answered.
GRAVEYARD SHIFT
Meaning of GRAVEYARD SHIFT in English
American idioms English vocabulary. Английский словарь американских идиом. 2012