There's an important, complicated network of neurons in your brain that only switches on when you stop working.

Neuroscientists call it the Default Mode Network (DMN) - a constellation of regions that activate when you're not focused on any external task. It lights up when you're staring out of a window. Walking home. In the shower. Lying awake at three in the morning. It's the brain at rest, except it’s far from idle. In fact, when you’re thinking of ‘nothing’, your DMN is doing something no amount of focused effort can replicate.

The DMN is where your mind wanders - and mind wandering, it turns out, is anything but a failure of attention. It's the kind of attention that connects things, thoughts, ideas and memories which don't obviously belong together. The kind of attention that pulls a half-forgotten conversation from Tuesday into collision with something you read last month and that conversation you had about your business growth plan, and produces, without warning, an idea you could never have reached by trying.

Research on the DMN has accelerated sharply in recent years. A record-breaking 2025 study published in Nature's Communications Biology found that creative ability can be predicted by how fluidly a person's brain switches between the Default Mode Network and the Executive Control Network. This is not about how hard they focus, or how many hours they spend on a problem, but how well they toggle between mind wandering and mind control. Spontaneity and discipline. Blue sky and solid earth.

When neurosurgeons at the University of Utah used electrical stimulation to disrupt the DMN while subjects performed creative tasks they noticed original, divergent responses dropped. The researchers concluded that when you limit the mind’s ability to wander, you disrupt the human ability to respond creatively. This factor, they said, is what markedly separates us from computers. Think about what this means for how we work.

We've designed organisations around sustained focus. Open-plan offices that eliminate privacy. Back-to-back meetings that eliminate transition time. Productivity tools that eliminate idle moments. Desk lunches and second-by-second productivity tracking. We've treated mind wandering as the thing that happens when people aren't being productive, and built entire cultures around eliminating it.

But neuroscience tells us we are making a big mistake (as Julia Roberts would say, huge). Idle moments are where the creative work happens. Not instead of focused effort, but alongside it. To do their best work, our brains need both the discipline to define a problem clearly, and the freedom to let the DMN do what only it can do - associate, connect, simulate, imagine. Remove either and you get inferior thinking.

This isn't an argument for laziness. It's an argument for a different kind of rigour. Of making space. Of protected silence. Of trusting that the walk after lunch is working time, in which your brain is doing something in the background that your conscious mind can't access.

I’m obsessed with the idea of ‘productive struggle’. Resisting the urge to fill every gap., or sitting with a question long enough for it to change shape, and for it to change our shape. Making space and time, for the discomfort of not-yet-knowing. Because that is the condition required for new understanding to grow in our messy, meaningful minds.