noun
end of a night shift; off night duty
Refers to the state or time after finishing a night shift, often implying tiredness or the start of free time.
夜勤明けで眠いので、すぐに寝ます。
I'm sleepy after the night shift, so I'll go to bed right away.
夜勤明けの朝は、いつもより静かに感じる。
The morning after a night shift feels quieter than usual.
明け means 'end' or 'after' in time expressions; 夜勤明け specifically refers to the end of a night shift.
Compound of 夜勤 (night shift) and 明け (end, after). The exact historical derivation is straightforward; the word is a modern compound.