夜深了英语怎么说

夜深了的英文表达是 "it's late at night" 或者 "it's getting late at night"。这个表达来源于晚上晚了，可以用来指示当前时间已经很晚了。
例句：
It's late at night, we should go to bed.
晚上很晚了，我们应该去睡觉了。
It's getting late at night, we should wrap up this meeting.
晚上快深了，我们应该把会议结束了。