地道美语:Sleep Like a Rock(视频字幕)

English in a Minute: Sleep Like a Rock（ZT）
http://learningenglish.voanews.com/media/video/english-in-a-minute/2688206.html?z=0&zp=1

Welcome to English in a Minute, when you listen to American English, you will probably hear this idiom: Sleep like a rock. How does a rock sleep? Let's listen.

---I remember you said you were getting a new bed last weekend. How do you like it? 
---I love it. My old bed totally bit the dust, but the new mattress is great. I slept like a rock last night.
---That is good to know. I have not been sleeping well at all lately. Maybe I should get a different mattress, too.

If you slept like a rock, you slept very well. You cannot wake a rock, because it is not alive. You can also say you slept like a log, to mean the same thing. And that's English in a minute.

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bite the dust : Sl. to break; to fail; to give out.

 My old car finally bit the dust.
This pen is out of ink and has bitten the dust.
http://idioms.thefreedictionary.com/bite+the+dust