Ted Hughes said this quote

Well, the terrible fact is that though we are all more or less thinking of something or other all the time, some of us are thinking more and some less.Some brains are battling and working and remembering and puzzling things over all the time and other brains are just lying down, snoring and occasionally turning over. It is to the lazy minds that I am now speaking, and from my own experience I imagine this includes nineteen people out of every twenty. I am one of that clan myself and always have been.