Meaning of 夜勤 in Japanese

Definition of 夜勤

やきん(yakin) 【夜勤】

(n) night shift
でも週に２回、夜勤しなくちゃいけないんだ。
But I have to take night shifts twice a week.

ほとんど全ての労働者ろうどうしゃ達たちは夜勤やきんに反対はんたいしたする。

Almost all the workers objected to working at night.

Freddy's been working the graveyard shift the past month, so he hasn't been able to see any of his friends who work normal hours.

でも週しゅうに２回、夜勤やきんしするなくちゃいけないんだ。

But I have to take night shifts twice a week.