To do something in one's sleep

Idiom: To do something in one's sleep

Context #1:

Sean: Did you finish the math homework yet?

Terry: Are you kidding?  It was so easy I could've done it in my sleep.

Sean: Oh, come on! It wasn't that easy!

Context #2:

Crissy: I heard your really good at making lasagna. Do you think you could teach me?

Sarah: Sure, I make it every week for my husband because he loves it.  In fact, I've made it so many times and I could do it in my sleep.

Crissy: Sounds great!

Meaning: "to do something in one's sleep" is used when something becomes so easy to do that you don't even have to really think about it or concentrate very much any more. 

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To bomb something

Idiom: to bomb something

Context #1:

Jim: How did you do on the History final exam yesterday?

Chuck: Actually, I think I bombed it!  I didn't study at all.

Jim: What were you thinking? That exam is like one quarter of our overall grade.

Context #2:

Sally: Can you help me study for the Geometry exam that we have next week?

Cathy: Sure! 

Sally: I am having a hard time in this class and I don't want to bomb the exam.

Cathy: No problem.  Let's meet at Starbucks tonight and I'll help you with it.

Meaning: "to bomb something" means to totally fail. It is most often used in an educational context, but it can also be used for such things like job interviews and projects.  

www.languagesystems.edu