He is a night owl.
　　他是个夜猫子。　

　　Scene
　　BILL: I saw Rik sleep in class several times. Does he often stay up late ?
　　Jany: Well, he has always been a night owl.

　　Notes
　　night owl 通常用来形容经常熬夜或通宵不睡的人. 也有night-bird的说法. Frankly speaking, I am a night owl too! and what about you ? ^_^

　　Exercises
　　下面我们来做看两个跟night有关的用法,你知道它们的意思吗?

　　1. He walked into the room like a thief in the night,
　　2. The meetings were held in secret at the dead of night.