The Method
By Pete Moulton, founder of Ultradia. Teaching the Ultradian Method since 2006.
The Ultradian Method is not a productivity hack. It is how your brain already works. We just stopped ignoring it.
In short
The Ultradian Method is a way of working built on your brain's natural 90-minute cycle of focus and recovery, first documented by sleep researcher Nathaniel Kleitman. You work in about 75 minutes of focus, then 15 minutes of real recovery, and you do it alongside peers so accountability keeps you consistent.
The Science
Kleitman was a sleep researcher at the University of Chicago. He discovered that our brains cycle through distinct phases every 90 to 120 minutes during sleep. He called it the Basic Rest-Activity Cycle.
What he found next changed everything: these same cycles continue throughout your waking day. Every 90 minutes, your brain moves through a period of high cognitive capacity followed by a period of natural decline.
Most people fight this cycle. They push through the decline with caffeine and willpower. The Ultradian Method works with it.
Your prefrontal cortex is engaging. Neural pathways are activating. You are building momentum toward peak focus.
Working memory at full capacity. Executive function firing. This is when the calls get made, the proposals get written, the reports get finished. This is what your brain was built to do.
Cortisol shifts. Glucose depletes. Your brain is signaling that it needs recovery. This is biology, not weakness.
After 75 minutes, your body needs 15 minutes of genuine recovery. Clear stress hormones. Replenish glucose. Reset neural pathways. Consolidate what you just learned.
This is when the best ideas crystallize. Stop trying to think harder. Give your brain room to think at all.
The Sprint
Microsoft studied 18 million work hours and found the average employee does 2 hours and 53 minutes of actual work in an 8-hour day. The rest is context switching, meetings, and distraction.
Six ultradian sprints is 7.5 hours of focused execution. Most people start with two sprints and add one each week. By week six, you are operating at a level most people cannot sustain because they are fighting their biology instead of working with it.
Accountability
I have been teaching the Ultradian Method since 2006. The people who stick with it do well. The people who stick with it inside a peer group do significantly better.
The reason is simple. When your Circle sees your sprint count, your completion rate, and your weekly commitments, you show up differently. Not because someone is watching over your shoulder. Because your peers are running the same method, and you can see their work too.
That is accountability in the open. The work becomes visible. Visible work becomes consistent work. Consistent work compounds.
The Ultradian Method is documented in UP: A Journey of Intention, Focus and Execution by Peter Moulton. The book covers the science, the daily practice, and the accountability framework in full detail.
Listen to Pete discuss the method on the podcast →The Ultradian Method is a way of working built on Nathaniel Kleitman's Basic Rest-Activity Cycle. Your brain runs in roughly 90-minute cycles: about 75 minutes of high focus, then 15 minutes of natural decline and recovery. The method works with that rhythm instead of against it, and pairs it with peer accountability so the work actually gets done.
A 25-minute interval is arbitrary and often pulls you out just as you reach deep focus. The 90-minute cycle follows your brain's natural ultradian rhythm, so you get a full block of real work and then a real break.
No. Most people start with two sprints and add one each week. Two sprints is still about 2.5 hours of focused execution, which is more real work than most people manage in a full day.
You run the method inside a Circle of peers who can see your sprint count, completion rate, and weekly commitments, and you can see theirs. The work becomes visible, and visible work becomes consistent work.
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