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Handbook · Foundations · 7 min read

How to work in sync with your own body

Circadian rhythm, sleep, food and movement — four biological levers that shape your performance more than any app ever will.

Have you ever tried coding at three in the morning, or writing an important report right after lunch? Then you know it isn't the best idea. It isn't your fault — it's biology. Let's put it to work for us instead of fighting it.

Circadian rhythm: your internal calendar

Your body's internal clock doesn't just govern tiredness and alertness — it drives body temperature, hormones and cognitive performance. And everyone's is set a little differently:

Lark vs. owl — a typical energy curve
  1. 5–6Lark: natural wake-uppeak productivity in the morning, winding down around 9 p.m.
  2. 8–9Owl: natural wake-uppeak productivity in the afternoon and evening, winding down after midnight
  3. PeakDemanding work at the energy peakdeep work, important decisions, creative thinking
  4. DipRoutine work during the slumpemail, admin, mechanical tasks

How to do it: track your energy and productivity for a week, find the recurring peaks — and schedule demanding tasks into your “peak” hours. If you can't adjust your working hours, at least adjust the order of tasks within the day.

Sleep: the foundation of performance

Quality sleep isn't a luxury. It's the time when your brain literally flushes out toxins and processes the day's information.

64–68 °Fbedroom temperatureplus complete darkness and quiet (or white noise)
±1 hconsistencythe same bedtime and wake-up time — weekends included
2 hdigital cutoffbefore bed, no blue light, caffeine, alcohol or heavy meals

In the morning, daylight as soon as possible after waking helps — and skip the snooze button.

Food: fuel for the brain

20 %
of the body's energy is consumed by the braineven though it's only 2% of your weight. What you eat directly shapes how you think.
  • Breakfast: complex carbs (oats), protein (eggs, yogurt), healthy fats (avocado, nuts) — within an hour of waking.
  • Lunch: light but nourishing. Plenty of vegetables, good protein. Heavy, fatty meals = an afternoon crash.
  • Snacks: nuts and seeds, fruit, veggie sticks with hummus.
  • Timing: main meals every 3–4 hours, the last one 2–3 hours before bed.
  • Hydration: 8–10 glasses of water a day, the first one right after waking. Cut caffeine after 2 p.m.

Movement: body in motion = brain in action

Exercise directly improves memory, focus, creativity and problem-solving.

The ideal movement mix (minutes per week)
Aerobic activity7 × 30 min
Strength training2–3× a week
Stretching10–15 min daily
  • Aerobic activity (walking, running, swimming, cycling): 30 minutes a day at moderate intensity, ideally in the morning or early afternoon.
  • Strength training 2–3 times a week: it boosts BDNF — a protein critical for learning — and improves sleep quality.
  • Stretching for 10–15 minutes daily: it counteracts the aches of desk work and lowers stress.

And during the workday: a morning stretch (5 minutes), a walk at lunch (15–30 minutes), micro-breaks every hour (2–3 minutes), and an evening walk for better sleep.

Putting it into practice

  1. First week: track your natural rhythm, set up an evening routine, start taking morning walks.
  2. First month: adjust your meal timing, establish regular exercise, optimize your sleep environment.
  3. Long term: tune your daily schedule around your energy and experiment — a sleep tracker and an energy journal will show you what works.

This isn't about radical changes. It's about gradually building habits that support the biology you already have.

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