hit the sack 上床睡觉

Hello, 各位亲爱的朋友大家好，今天和大家分享的是：

hit the sack 上床睡觉

A: What time did you go to bed last night?

B: I didn't hit the sack until after twelve. That's why I look so tired.

(A: 你昨晚几点睡？)

(B: 我十二点过后才就寝。所以我看起来才会这么累。)