Hi Marisaf; i would wait at least 20 minutes but you can wait 4 hours, 8 hours even 24 hours. You want to allow time for the mind to process the book you photoread.So i would suggest that you do not mindmap immediately after photoreading a book. Do something else completely unrelated to the book Go for a walk, ride a bike something completely unrelated to the book for you allow your mind time to process the information you photoread.

As for being relaxed to the point of being asleep you notice that Paul Scheele talks about the relaxed but alert state. That says it all. You want to be relaxed but not too relaxed.
Photoread4me