Busy is not a badge of honor
Professional runners have to rest their leg muscles. Carpenters have to rest the muscles in their hands. If the primary muscle you use to do your job is your brain, you need to learn how to rest it, too. For the knowledge worker, that means large chunks of unstructured time spent doing nothing. That’s right, nothing. Not reading Twitter, listening to a podcast or texting with your customers. I’m talking about the kind of nothing where the brain finally gets to relax. Sitting still, taking a nap, riding a bike. That kind of nothing.
From the New York Times — https://www.instapaper.com/read/1166336275