I've been thinking... I have heard that everything we see, hear or experience in our lives is stored in our subconcious memory; even though we have only limited access to it.
For example, if I read a book, I will not be able to say what exactly is written on page 135.
I'm gonna do a little experiment. The dreamworld is the world of the subconcious, right?

I'm going to read a page of a random book. Any page, and I'm just gonna read it quickly, without thinking too much about what is written there.
Then I go to sleep. If I have an LD, I go to my room, pick up the book that is conveniently there, go to that page; and read one random sentence on that page. I will study that sentence and memorize it.
When I wake up, I will get my real book; and check whether the sentence is there. What do you guys think?