In the realm of knowledge work, the traditional factory model of consistent, intense work throughout the day proves ineffective. Productivity in tasks that require cognitive effort necessitates periods of intense thinking, rest, unstructured time for insights, and careful refinement. To sustainably produce high-level cognitive work, there must be a fluctuation in cognitive intensity. Implementing cycles, similar to work and rest intervals, promotes effective cognitive work. Companies can adopt this by structuring work into key projects followed by downtime for reflection and planning. Embracing varied cognitive intensity is crucial for optimal performance in knowledge work.