我经常三更半夜陷入沉思，迷失自我。

I often lose myself in thought late at night!

他们说他过去经常在三更半夜外出。

They said he used to go out in the dead of night.

你不在家时，你爹妈会在电话中询问你是否吃饭了，即便是在三更半夜。

If you don't live at home, when your parents call, they ask if you've eaten rice, even if it's midnight.

你们工作到三更半夜，盘根错节的论文一再地让你们在找出解决方法还是一头钻进研究之间弄得进退两难。

You are working well past midnight, the thesis turned into a maze and you constantly are Tom between wanting to find the way out or in.