Sleep is a time when the דמיון is in control. טומאת קרי is the creation of a potential person from the world of דמיון. THAT is טומאה.
יעקב never saw קרי. He was מתקן חטא אדם הראשון which came from an overly developed דמיון. The תיקון of דמיון is letting the שכל rule. יעקב was איש האמת and איש השכל so he COULDN'T have קרי.
["זה השער"]
