catch some Zs 小睡一下

A: Excuse me. I have to catch some Zs.

B: I thought you just woke up. Sleepy head.

　A: 抱歉! 我想小睡一下。

B: 我以为你才刚睡醒。爱睡虫。

漫画里的人睡觉, 不是都画"Z,Z,Z..."来表示吗? 这里的 "catch some Zs" 就是这样来的。"I have to catch some Zs." 也可以说"I have to take a nap." 或 "I need to snooze."。