noun
dead of night; middle of the night
Emphatic form of 夜中, emphasizing the deep, quiet hours of the night. Often used in literary or dramatic contexts.
See also: 夜中
夜夜中に電話が鳴って驚いた。
I was startled when the phone rang in the dead of night.
夜夜中の公園は誰もい
The park in the middle of the night was quiet with no one around.