Ugh...Yahoo Answers. I avoid that place like the plague. It should have been called Yahoo Hearsay.
Not even going to bother to comment on that piece in detail. Let's just say that if I were a teacher and someone would deliver this to me, I would write "source?" or "why?" after pretty much every sentence.
Also, using exact percentages with abstract concepts... that should be cause for alarm in anyone's mind.
Please note that I'm not taking a stance against the concept you are talking about Plendakor. Quite frankly, i don't know anything about it. I do know poorly written pieces when I see them though, and I would be highly cautious to take life advice from the person who wrote this. I'm sure there are much more reliable sources for this theme out there, if you are very interested in it. Maybe some research paper by some sleep laboratory?