Any of these things looked at invidually might just seem like harmless quirks, but taken in totality with his other sociopathic behavior, I think it is more a sign of his mental illness.
* Harbaugh does sleepovers at the homes of recruits. In one particular case, a recruiting dead period ended at midnight. Like some crazed stalker, Jimbo is knocking on the door of this top recruit at 12:01 AM. In the words of the recruit, "he said we can watch a movie, see how well we gel and he said he would sleep over after that." The recruit offered him the guest bedroom, but Jim insisted on sleeping on the floor in the recruit's room. Fortunately, the recruit ultimately had sense enough not to become a "Michigan man."
* Harbaugh wears cleats everywhere, and never takes them off (at least in public). He wears them driving, he wears them flying, he wears them in restaurants, he wears them lifting weights, he wears them in the homes of recruits. One former player said he has never seen Harbaugh without his cleats on. One five-star recruit told the story of Harbaugh coming into his home, which has hardwood floors, and Jimbo refused to take his cleats off as he is waltzing around. As the recruit said, "after that, it was over."
* Harbaugh harrasses his players if he sees them eating white meat. From an article on the topic...
As Pete Carroll once famously asked Harbaugh after a game, "What's your deal?" When it comes to Jimbo, that question goes well beyond a single game.Former Michigan QB Wilton Speight told Bleacher Report that Harbaugh spoke with him privately to advise the QB not to eat chicken.
Speight, confused, asked for an explanation, and Harbaugh replied by saying chicken is “a nervous bird.” Of course, that makes no sense, but Harbaugh apparently has a theory about white meat.
“He thinks some type of sickness injected its way into the human population when people began eating white meats instead of beef and pork,” Speight said. Yes, this sounds too absurd to be true, but Speight was adamant that Harbaugh “believes it, 100 percent.”