深夜（しんや）2時（じ）に寝（ね）たんだって？今日（きょう）眠（ねむ）そうなのも当然（とうぜん）だね。

You went to bed at 2 o'clock in the morning? No wonder you look sleepy today.

私（わたし）はよく深夜（しんや）にラジオを聞（き）いたものだ。

I used to listen to the radio very late at night.

彼（かれ）は日夜（にちや）働（はたら）いて過労（かろう）になった。

He worked day and night and overworked himself.

彼（かれ）は金持（かねも）ちになるために、日夜（にちや）働（はたら）いた。

He worked day and night so that he might become rich.