夜よる遅おそく

adverb, noun

late at night; at a late hour

Refers to the late hours of the night, often used adverbially or as a noun.

• 夜よる遅おそくまで勉べん強きょうした。

  I studied until late at night.

• 夜よる遅おそくに帰き宅たくした。

  I came home late at night.