1The middle of the night — roughly the hours around midnight. Frequently used as an adverb (夜中に〜) to mean 'do something late at night / in the middle of the night'. Read よなか — the standard everyday reading.
夜中に大きな物音がして目が覚めた。
A loud noise woke me up in the middle of the night.
夜中まで仕事をしていたので、朝起きるのがつらい。
I worked until late at night, so it's rough getting up in the morning.
夜中の二時に電話がかかってきて、何事かと驚いた。
I got a phone call at 2 a.m. and was alarmed, wondering what had happened.
うちの子は夜中に何度も目を覚ましてしまう。
My child wakes up several times during the night.
夜中にお腹が空いて、つい何か食べてしまった。
I got hungry in the middle of the night and ended up eating something.