at midnight; in the middle of the night(▼現代英語ではmidnightは夜の12時を意味するので夜中を指す時にはthe middle of the nightを使う);in the dead of night
- 夜半すぎに地震があった
- There was an earthquake sometime after midnight.
- 夜半まで
- till midnight/till late at night
- 夜半から雪が降っている
- It has been snowing since the middle of the night.