深しん夜や

noun, adverb

late at night; midnight; the wee hours

Refers to the deep night hours, typically from around midnight to dawn. Often used in compounds like 深夜営業 (late-night business) or 深夜番組 (late-night TV show).

• 深しん夜やまで仕し事ごとをした。

  I worked until late at night.

• このコンビニは深しん夜やも営えい業ぎょうして