寝ずに

without sleeping

→ 寝る
phrase Rare #32,305
without sleeping A formal or literary negative ずに form of 寝る, meaning “without sleeping” or “staying awake.”
JA: 試験の前日は寝ずに勉強した。
EN: I studied without sleeping the night before the exam.

奥様お帰り寝ずにお待ちしたものです

I used to stay up waiting for your wife to come home.

— レベッカ (1940)

彼は寝ずに一夜を明かした

He stayed up all night.

パーティーでは子供たちは寝ずに起きていて行儀よく振る舞った

At the party, all the children stayed awake and behaved well.

彼らは寝ずに一夜を明かした

They stayed up all night.

彼は病人寝ずに看病した

He stayed up all night caring for the sick person.