TIL: The in-between moments (queue waits, build runs, the walk to the coffee maker) aren’t dead time. They’re DMN-time, and naming them that way changes what you do with them.
The Default Mode Network is the brain’s idle loop. It kicks in the second focused attention drops: between meetings, while the test suite churns, mid-shower. It ruminates, rehearses, replays. Left unlabeled, it feels like wasted time you should be filling with a podcast or a Slack scroll.
Label it, though, and the same minute reads differently. “I’m in DMN-time” is permission for the network to do its actual job: consolidating, connecting, surfacing the thing you couldn’t name in the standup. The lever isn’t doing more during the gap. It’s not reaching for the phone.
The default move when attention drops is to refill it: second monitor, second tab, second input stream. That kills the DMN before it can produce anything. Calling the gap “DMN-time” is small, but it’s the difference between a build run that returns me a half-formed insight and a build run that returns me to TikTok.
Additional Resources#
- Taming the DMN
- The Brain’s Default Mode Network (Raichle, 2015): the foundational review paper, if you want the neuroscience.
- Cal Newport on the value of boredom: the productivity-side argument for not refilling every idle moment.
