深夜用英文表达是：深夜；

late：adj. 接近末期; 在晚年; 迟到; 迟发生; 迟做; 近日暮的; 近深夜的。

night：n. 夜; 夜晚; 晚上，夜晚(夜里就寝前的一段时间); (举行盛事的)夜晚; …之夜。

She had to work late at night

她不得不深夜工作。

Strong coffee or tea late at night may cause sleeplessness

深夜喝浓咖啡或浓茶可能会导致失眠。

I don't ride the subway late at night.

我深夜不坐地铁。

The couple wed late at night in front of just nine guests

深夜这对情侣在仅有的9位宾客面前举行了婚礼。

It was late at night and he was still working away at his homework.

夜深了，他还在做课外作业。