sleep in：睡懒觉

I sleep in every weekend and wake up around noon.
周末我通常会睡个懒觉，到中午才起来。

doze off：打瞌睡

Some students often doze off in class.
有些学生常在课堂上打瞌睡。

have a siesta：睡午觉

Most people here take a siesta after lunch.
这里大多数的人吃过中饭就睡觉。

have a short doze：可以表示早上按掉闹钟后，再睡一小会儿的“回笼觉”

早睡特别对女生很重要，可称为“美容觉”，就是beauty sleep。

sleep like a log：睡觉很沉

Everyone in our family sleeps like a log, so no one heard the thunderstorm in the middle of the night.
家人都睡得很沉，没人听到半夜的打雷声。

a heavy/sound sleeper：睡觉很香甜

I'm such a heavy sleeper that the explosion didn't wake me.
我睡得很死，连爆炸声都没有把我吵醒。

take a little catnap：打吨儿，小睡一下

I'll meet you at the movies right after I take a little catnap.
我先打个盹再到电影院和你碰面。