Intensive exercise - I remember P.J.Eby saying he'd use intensive exercise (in his case I thin it was running across his house) as a "reset button" for the mind. It's pretty cheap to try! (I have occasionally did that - pushups, usually - though it's more often to get rid of angry annoyance than distractions)
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.