write a story with idioms I learned today. -thanks for anyone who is willing to correct me!

Nice job. Its good to practice using idioms like this, but in normal writing or speaking you don't want to use too many, it can make you sound awkward and unnatural. 

Mr. X saved me in the 11th hour. If it wasn't for him, I'd be a dead body. I was doing cross words this morning to kill some time, and totally forgot about the stew in the kitchen. The flame had somehow gone out and gas was leaking, which made me feel sleepy. I'd like to catch 40 winks, I was thinking. In the nick of time, I heard someone knocking at the door. It turned out to be Mr. X, who visits me once in a blue moon. As I heard him knocking, I couldn't answer it...