Stage 4: Strategy | Living By Your Rhythm

Most productivity advice starts from the same assumption: everyone works the same way. Wake up at 5am, do deep work first thing, batch your meeting, follow the system.

And you've probably tried some of it. Maybe a lot of it. Some of it stuck, but most of it probably didn't. The parts that didn't stick weren't necessarily bad advice. They were advice built for someone else's body, someone else's nervous system, someone else's internal clock.

Your energy has patterns that show up daily, weekly, seasonally, and emotionally. These patterns are biological, are measurable and they repeat. Designing a life strategy that ignores these rhythms is like planting seeds in the wrong season. The seeds might be perfect and the soil - ready, but the timing can kill the harvest.

This section helps you map your actual rhythms, identify where your current life is fighting them, and build a personal operating system that works with your biology instead of against it.

The research behind rhythm

Chronobiology and chronotypes

Your body runs on an internal clock. Chronobiology is the field that studies these clocks, and it's been producing solid research since the 1970s.

Till Roenneberg, a chronobiologist at Ludwig Maximilian University of Munich, has spent decades collecting data on human sleep patterns. His research shows that chronotype (whether you're naturally early, late, or somewhere between) is largely genetic and varies across populations. About 25% of people are strong morning types. About 25% are strong evening types. Everyone else falls somewhere in the middle. Roenneberg coined the term "social jetlag" to describe the mismatch between your biological clock and your social schedule. If your body wants to sleep until 8am but your alarm goes off at 6, you're living in chronic misalignment. His data shows that social jetlag correlates with higher BMI, increased tobacco and alcohol use, and lower well-being.

Michael Breus, a clinical psychologist and sleep specialist, built on this research with a four-chronotype model published in The Power of When (2016). His types: Lion (early riser, peak energy in the morning, winds down by evening), Bear (follows the solar cycle, most alert mid-morning, needs a solid 8 hours), Wolf (late riser, peak energy in the late afternoon and evening, struggles with early mornings), and Dolphin (light sleeper, variable energy, often wired but tired). Breus mapped each type to ideal timing for work, exercise, eating, and social activity.

Daniel Pink pulled this research together for a general audience in When: The Scientific Secrets of Perfect Timing (2018). Pink's contribution was synthesising hundreds of studies into a practical argument: when you do something matters as much as what you do or how you do it. His review of the evidence on time-of-day effects found that analytical tasks are best done during your peak hours, while creative tasks (which benefit from looser, less inhibited thinking) are often better suited to your off-peak hours.

Ultradian rhythms

Your energy doesn't hold steady even within your best hours. It cycles.

Nathaniel Kleitman, one of the founders of modern sleep research, proposed the Basic Rest-Activity Cycle (BRAC) in the 1960s. He observed that the 90-minute cycles of REM and non-REM sleep don't stop when you wake up. During the day, your body continues cycling between periods of higher and lower alertness roughly every 90 minutes.

Peretz Lavie, a sleep researcher at the Technion in Israel, confirmed this pattern through a series of studies in the 1980s and 1990s. His research showed that alertness, cognitive performance, and even the likelihood of falling asleep follow a predictable ultradian rhythm. You have roughly 90 minutes of focused capacity followed by a 15 to 20 minute dip.

The practical implication is straightforward. Working in 90-minute blocks with genuine breaks between them matches what your body is already doing. Pushing through the dips doesn't produce more output; it produces worse output and more fatigue.

Seasonal patterns

Norman Rosenthal, a psychiatrist at the National Institute of Mental Health, published the first systematic description of Seasonal Affective Disorder (SAD) in 1984. His research showed that seasonal light changes affect mood, energy, appetite, and sleep in measurable ways. About 5% of the population experiences full SAD, but a much larger percentage (estimates range from 10 to 20%) experience subclinical seasonal mood shifts.

You don't need a diagnosis to feel this. Winter typically brings lower energy, more inward focus, a pull toward rest and reflection. Summer brings expansion, social energy, longer working hours that feel sustainable. These aren't failures of discipline. They're seasonal biology.

Cultures that lived closer to the land understood this intuitively. They planted, grew, harvested, and rested in rhythm with the seasons. Modern life pretends January and July require the same output, but your body knows better.

Your nervous system and creative capacity

Stephen Porges developed Polyvagal Theory across a series of papers beginning in 1995. The theory describes three states of the autonomic nervous system: ventral vagal (safe, socially engaged, calm), sympathetic (activated, fight or flight), and dorsal vagal (shut down, collapsed, frozen).

The part that matters here: creative, expansive, forward-looking work requires ventral vagal activation. You need to feel safe. When your nervous system is in sympathetic activation (stressed, anxious, rushed), your brain narrows its focus to immediate threats. You can push through administrative tasks or answer emails n that state, but you can't do the kind of open, connective thinking that strategy and life design require.

This is why some of your best ideas come in the shower, on a walk, or right before sleep. Those are moments when your nervous system drops into safety. Your brain stops scanning for threats and starts making connections.

Building a life that supports creative work means building a life that keeps your nervous system regulated. Chronic stress doesn't just feel bad - it literally prevents the kind of thinking you need for the work ahead.

Exercises

Access your Notion workbook here.

Exercise 1: Your energy map

You will have tracked you energy during previous exercises. You can use what you have learned there to complete this exercise. For each of the below, rate your energy level from 1 to 10, and describe the best type of work for each slot versus how you actually spend this time:

• Early morning (6-8am)

• Mid-morning (8-11am)

• Early afternoon (2-5pm)

• Evening (5-8pm)

• Night (8pm+)

Types of work to consider: creative (writing, designing, strategic thinking), admin (email, scheduling, routine tasks), social (meetings, calls, collaboration), physical (exercise, movement, errands), rest (genuine downtime, not scrolling).

• What patterns do you notice?

• Where is the biggest gap between your peak energy and how you're spending it?

Exercise 2: Your chronotype profile

Read the four chronotypes below and mark the one that fits you best. Most people recognise themselves quickly. If you're torn between two, note both and see which one feels truer over a week of observation.

Lion

Wakes early without an alarm. Peak energy and focus in the morning. Most productive before noon. Energy drops noticeably after 3pm. Prefers early dinners and early bedtimes. Often described as driven, disciplined, and practical.

Bear

Follows the solar cycle. Wakes with the sun (or close to it), feels most alert mid-to-late morning. Energy dips after lunch, recovers somewhat in the late afternoon. Needs a full 8 hours of sleep. Sociable, open, and easy-going. This is the most common type (roughly 55% of the population).

Wolf

Slow to wake. Mornings feel groggy and forced. Energy picks up in the late morning, but the real peak comes in the late afternoon and evening. Can do focused, creative work at 10pm when everyone else is winding down. Often creative, introverted, and drawn to novelty.

Dolphin

Light, irregular sleeper. Often tired but mentally wired. Energy is variable and harder to predict. Can be highly productive in bursts but struggles with sustained focus. Tends toward perfectionism and anxious thinking. Needs more structure to compensate for less predictable rhythms.

Your chronotype:
How your current schedule matches your type:
Where does your daily schedule align with your chronotype? Where does it clash?
One change you could make to better match your type:

Exercise 3: Your seasonal rhythm

Think back over the past few years. You'll notice that your energy, mood, and capacity shift with the seasons. Think about what kind of work and life feels natural to you in each quarter of the year and answer the questions below for each (Spring, Summer, Autumn, Winter):

• How you typically feel?

• What kind of work suits this season?

• What should you protect during this season?

"Protect" means: what do you need to guard during this season that you tend to neglect? In winter, maybe it's rest. In summer, maybe it's boundaries around social energy. In autumn, maybe it's finishing things instead of starting new ones.

Then consider the following:

• Your strongest season (where you feel most alive and capable)

• Your most difficult season (and what you usually do wrong during it)

Exercise 4: Your personal operating manual

Now write your own user manual. Be specific, because vague answers like "I work best when I'm motivated" don't help. What actually motivates you? What specific conditions, times, environments, and inputs make you function well?

Start with these:

• I work best when...

• I shut down when...

• My peak creative hours are...

• I need recovery after...

• The warning signs that I'm running on empty

• My non-negotiable rest practices

What do you need to do regularly to stay regulated? Be specific about frequency, duration, and what happens when you skip them.

Exercise 5: The rhythm audit

This is where you compare what your body needs with what your life currently asks of you in the mornings, afternoons, evenings, weekends and seasonally. The gap between the two is your friction. Some friction is unavoidable (you can't always control your schedule), but some friction is self-imposed, and that's where you have room to redesign. Finish the following:

• The friction you can reduce right now (within your current constraints) is...

• The friction that requires a bigger structural change is...

• The friction you've been tolerating because you assumed it was normal is...

Reflection

• When in the last year did you feel most in flow? What time of day was it, what season, and what were the conditions?

• What parts of your schedule do you dread? Is the problem the task itself, or the timing?

• If you could redesign tomorrow with zero obligations, what would your natural day look like from waking to sleeping?

• Where are you performing discipline when you actually need rest? Where are you resting when you actually have energy to spend?

• What would change if you stopped treating every season of the year (and every season of your life) as if it should produce the same output?

• Who in your life already seems to live by their own rhythm? What do you notice about how they've structured things?

AI companion (optional)

How to use: Complete all five exercises first. The more specific your inputs, the more useful the AI's suggestions will be. Paste your actual answers, not summaries.

Copy and paste the prompt below into Claude, ChatGPT, or any AI assistant:

I'm working on designing my life around my natural rhythms.
Here's what I know about myself so far: [Paste your chronotype, your energy map findings, your seasonal rhythm observations, and your operating manual from the exercises above]
Based on this, help me:
(1) Identify the 2-3 biggest mismatches between my natural rhythm and my current schedule
(2) Suggest specific, practical changes I could test this week to reduce friction
(3) Design a rough "ideal week" template that respects my chronotype and energy patterns
(4) Flag any patterns you notice that I might be too close to see.
Be specific and practical. I don't need general advice about sleep hygiene or morning routines. I need suggestions that fit my particular rhythm profile.