This is absolutely fascinating. I'm really interested to learn why this seems to work so reliably well. What's going on on a chemical/electrical level in the brain during N1 sleep that gives it this unique ability, and why does it go away if you go too deep and enter N2 sleep? Also, I'm incredibly eager to try this out now. First I've heard of it and it seems too good to be true.
[1] As in... simply looked. I did not try to solve it consciously.