log [l??ɡ] n. 原木

doze [do?z] v. 打瞌睡

prandial ['pr?nd??l] adj. 膳食的，正餐的

post－prandial 餐后

hit the sack[s?k] 就寝

hit the hay 就寝

doze off 打瞌睡

Some students often doze off in class.

有些学生常在课堂上打瞌睡。

I often doze off in class

我经常在课上睡觉

After working for a whole day, I slept like a log.

干了一整天活，我睡得很沉。

A post-prandial snooze sets the brain up for learning and working. 

午餐之后打个小盹会让头脑更清醒，学习工作更有效率。

Let's hit the sack/hay. We have to get up in the morning.

我们睡吧，早上得早起呢！