In her latest book, neuroscientist Mithu Storoni explains how our brains operate in cycles that affect productivity. These cycles, known as the Basic Rest-Activity Cycle (BRAC), suggest that our mental alertness rises and falls in approximately 90-minute intervals. By understanding these natural rhythms, professionals can optimize their work habits for greater efficiency.

The Reality of Mental Fatigue

Just like sleep cycles, our brains need regular breaks during the day to maintain high performance. Studies show that after around 90 minutes of intense focus, mental fatigue sets in. Taking short, frequent breaks helps reset the brain and allows it to stay sharp. This approach can prevent burnout and improve overall output.

Structuring Work Sessions for Maximum Efficiency
Storoni suggests breaking down work sessions into 60-90 minute chunks, followed by a brief 10-minute break. Start each session by tackling the most demanding tasks when your mind is at its sharpest. As your mental energy wanes, shift to less intensive tasks. This pattern ensures that you make the most of your productive window without overextending your mental resources.

Why Shorter, Focused Sessions Work Best
Attempting to work continuously for long stretches can lead to diminished performance. Limiting intense focus to four hours a day helps preserve mental stamina, allowing for better recovery and sustained productivity. Creative tasks, on the other hand, may require more flexibility, as structured timeframes can interrupt the flow of ideas.

Balancing Intensity and Creativity

For creative professionals, strict schedules can be counterproductive. Storoni advises allowing creative minds to work without rigid timeframes. Structuring work sessions in line with mental energy patterns helps strike a balance between focused productivity and the freedom needed for innovation.