If you had the perception that you are very stressed out then your grey matter was fully 20 per cent smaller in volume than people who did not have that same feeling. This is the grey matter in your prefrontal cortex: It controls thinking, learning, planning, decision-making. That matters because when we are feeling more stressed, that is when we are at our most vulnerable in our inability to think our way out of it.

I was afraid that I would find out that I didn't work hard, that I wasn't a very good mother. I was feeling so inadequate in everything I did. I was afraid that I was going to come out being this crazy, disorganized, neurotic person. So it was revelatory that I worked more than 50 hours a week and I still spent a tonne of time with my kids. It was like, "Why do I feel one way when the reality is so different?"

It's become such a cultural norm that people brag about it: "Oh yeah, you did that? I did this." Keeping up with the Joneses used to be about "I have the bigger house and car," and now it's much more about how much stuff you can cram into your calendar.

On a personal level, I do a "brain dump" where everything that's in my head that needs doing gets written down. It gives your brain a rest. And then I give myself permission not to do everything on that list. I'm much more clear about my priorities: What are those moments of connection that are most important to me? Today is a busy workday but it's also a snow day, so I'm going cross-country skiing with my husband. And then I'll come back and finish my work.

Because this is how it feels to live my life: scattered, fragmented, and exhausting.

What's happening now with technology is we live with very porous boundaries. All those little interruptions fragment our time and attention and make us feel like work never ends. It makes us feel like we don't ever have that sacred time for family or to breathe or meditate or for leisure. Time is contaminated for everyone. I'm hoping that as we get used to these technologies we'll get smarter about how we use them and also how to shut them off.

As work weeks get longer and leisure time shrinks, people are becoming sicker, more distracted, absent, unproductive, and less innovative.