夜よ深ぶかい

i-adjective

up late at night; staying up late

Describes the state of being awake deep into the night; often used in the phrase 夜が深い or 夜も更けて.

• 夜よ深ぶかい時じ刻こくなので、そろそろ寝ねましょう。

  It is a late-night hour, so let's go to bed soon.

• 彼かれは夜よ深ぶかくまで勉べん強きょうしている。

  He studies until late at night.