Ultradian rhythm productivity: how 90-minute cycles change the way you work
Your brain doesn't work like a machine. It runs in 90-minute cycles of focus and recovery.
What are ultradian rhythms?
90–120 minute biological cycles (the BRAC) that drive how well you focus through the day.
The science behind 90-minute sprints
Neuroscience on prefrontal-cortex fatigue and Anders Ericsson's research on elite performers.
How to structure your day
A six-sprint schedule from morning to late afternoon, each sprint with a specific focus.