If you slept through something, you did not wake up in time to attend it; you slept until after the event was over.
The idiom "slept like a log" means sleeping very deeply and soundly, to the extent that one is completely unaware of their surroundings and doesn't wake up easily. The phrase is often used to describe a very restful and uninterrupted sleep.
"Getting some winks" is a common idiom for getting some sleep. If someone is said to have not slept one wink, that means he/she basically wasn't able to sleep at all, either due to events during the day constantly interfering or due to a bout of insomnia.
If your plans fall through, it means they did not work out.
This is not an idiom. An idiom is an expression whose meaning cannot be deduced from its elements. To go through fire and water for someone is easily understood to mean to make a special effort and to undergo difficulties for that person's sake.
To seek a favor from someone through flattery
I once slept in the Lincoln bedroom at the White House. I slept through the movie. We slept through the earthquake. I slept over at a friends house. ect.
It means that someone was very sick, but they recovered after a long battle with illness.
RFP is not an idiom. It's an abbreviation.
It's not really an idiom. It means "what are you thinking about."
It is not an idiom, it means your nose is itching.
"Slept like a rock" means that someone slept very soundly, indeed.
idiom means expression like a page in a book