Another benefit of a sender filter is that it resets expectations. The most crucial line in my description is the following: “I’ll only respond to those proposals that are a good match for my schedule and interests.” This seems minor, but it makes a substantial difference in how my correspondents think about their messages to me. The default social convention surrounding e-mail is that unless you’re famous, if someone sends you something, you owe him or her a response. For most, therefore, an inbox full of messages generates a major sense of obligation. By instead resetting your correspondents’ expectations to the reality that you’ll probably not respond, the experience is transformed. The inbox is now a collection of opportunities that you can glance at when you have the free time — seeking out those that make sense for you to engage. But the pile of unread messages no longer generates a sense of obligation. You could, if you wanted to, ignore them all, and nothing bad would happen. Psychologically, this can be freeing.

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When an entire cohort unintentionally eliminated time alone with their thoughts from their lives, their mental health suffered dramatically. On reflection, this makes sense. These teenagers have lost the ability to process and make sense of their emotions, or to reflect on who they are and what really matters, or to build strong relationships, or even to just allow their brains time to power down their critical social circuits, which are not meant to be used constantly, and to redirect that energy to other important cognitive housekeeping tasks. We shouldn’t be surprised that these absences lead to malfunctions.

The reason knowledge workers are losing their familiarity with deep work is well established: network tools. This is a broad category that captures communication services like e-mail and SMS, social media networks like Twitter and Facebook, and the shiny tangle of infotainment sites like BuzzFeed and Reddit. In aggregate, the rise of these tools, combined with ubiquitous access to them through smartphones and networked office computers, has fragmented most knowledge workers’ attention into slivers.

Decades of work from multiple different subfields within psychology all point toward the conclusion that regularly resting your brain improves the quality of your deep work. When you work, work hard. When you’re done, be done. Your average e-mail response time might suffer some, but you’ll more than make up for this with the sheer volume of truly important work produced during the day by your refreshed ability to dive deeper than your exhausted peers.

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As I argued, when you delegate productivity decisions to the individual, it’s not surprising that you end up stuck with a simple, flexible, lowest common denominator–style workflow like the hyperactive hive mind.

I have been a happy man ever since January 1, 1990, when I no longer had an email address. I’d used email since about 1975, and it seems to me that 15 years of email is plenty for one lifetime. Email is a wonderful thing for people whose role in life is to be on top of things. But not for me; my role is to be on the bottom of things. What I do takes long hours of studying and uninterruptible concentration.

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if you keep interrupting your evening to check and respond to e-mail, or put aside a few hours after dinner to catch up on an approaching deadline, you’re robbing your directed attention centers of the uninterrupted rest they need for restoration. Even if these work dashes consume only a small amount of time, they prevent you from reaching the levels of deeper relaxation in which attention restoration can occur. Only the confidence that you’re done with work until the next day can convince your brain to downshift to the level where it can begin to recharge for the next day to follow. Put another way, trying to squeeze a little more work out of your evenings might reduce your effectiveness the next day enough that you end up getting less done than if you had instead respected a shutdown.