What does "graveyard shift" mean?

A work shift late at night, especially one from midnight to 8 AM on a three-shift schedule.

What is a synonym for "graveyard shift"?

Common synonyms include: bit, dogwatch, full time, half time, night shift, overtime.

noun

noun ·Rare ·Advanced level

Noun

1
A work shift late at night, especially one from midnight to 8 AM on a three-shift schedule.
"Near-synonym: night shift (sometimes synonymous; sometimes coordinate)"
2
workers who work during the night (as midnight to 8 a.m.) wordnet
3
A group of workers who work during this time slot.
"Near-synonym: night shift (sometimes synonymous; sometimes coordinate)"
4
the work shift during the night (as midnight to 8 a.m.) wordnet

"Near-synonym: night shift (sometimes synonymous; sometimes coordinate)"

By association of the spooky, cold and silent properties of both the night and graveyards.