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.

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.

Busyness has become such a social value that we will even create it, we will create that sense of breathlessness because we think that's how we show status and importance. That is a really interesting and troubling finding. We've taken this notion of hard work to a crazy degree.

I think that was probably one of the biggest revelations, is leisure is really in the eyes of the beholder...

What often matters more than the activity we're doing at a moment in time is how we feel about 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?"