graveyard shift
A work shift that occurs late at night. I'm a morning person, so I could never work the graveyard shift like you do.
graveyard
A place where broken-down, old, unusable objects are kept. Likened to an actual graveyard (a cemetery). I like checking out all the cool old steam engines at the train graveyard.
graveyard shift
n. the night shift of work in a factory, usually starting at about midnight. (see also swing shift.) The pay is pretty good on the graveyard shift.