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Oh, I see. Thanks waxwing.
So it's not that case.

Sorry, I didn't get it.

Just yesterday I read a John Grisham book (I don't think he's uneducated or something) and came across this:

- How much does he know? If you'll tell me, I'll be in a...

It's not this case. The book says:

We don't usually use "if...will" in conditional sentences. However, we can use "if...will" when we talk about a result of something in the main clause.


I'd...

Tell it to Martin Hewings, the author of Advanced grammar in use (CUP) :)
It says it could be said that way but nothing about the difference.

What about "Buy me a bottle of vodka, if you go shopping"?
Купи мне водки если ты ходишь по магазинам?

Could someone please explain me the difference:

1) Open a window if it will help you to sleep.
2) Open a window if it helps you to sleep.