夜よを明あかす

expression, godan verb (-su)

stay up all night; spend the night without sleep

Used when someone intentionally or unavoidably stays awake through the entire night, often for work, study, or conversation.

• 友とも達だちと話はなしながら夜よを明あかした。

  I stayed up all night talking with a friend.

• 試し験けん前まえはよく夜よを明あかして勉べん強きょうする。

  Before exams, I often stay up all night studying.