noun
middle of the night; dead of night
Refers to the late-night hours when it is quiet and dark; often used in literary or descriptive contexts.
夜半に目が覚めて、それから眠れなかった。
I woke up in the middle of the night and couldn't get back to sleep.
夜半の静けさが好きだ。
I like the stillness of the dead of night.