Skip to content

Ultradian rhythms

Your 90-minute rhythm

Inside the 24-hour day, your brain and body move through shorter cycles of focus and rest — roughly every 90 minutes. Learn to ride the wave instead of fighting it.

The basic rest-activity cycle

A single 90-minute cycle moves through five distinct phases.

0 min45 min90 min

  1. 0–15 min

    Ramp-up

    Your nervous system shifts into gear. Ease in with low-stakes tasks before diving into deep work.

  2. 15–60 min

    Peak focus

    Attention, working memory and reaction time are at their sharpest. Guard this window for your most demanding work.

  3. 60–75 min

    Plateau

    Performance holds steady but begins to soften. A good time to wrap up a task rather than start a new one.

  4. 75–85 min

    Transition

    Attention drifts, micro-errors climb and you may feel restless or foggy. This is the natural signal to pause.

  5. 85–90 min

    Recovery

    A short reset — movement, water, daylight — refills your reserves for the next cycle.

Meet the three types

Each reflects a different relationship with focus and rest. Read through them, then take the quiz.

45m / 15m

Sprinter

You thrive in short, intense bursts. Stacking focused 45-minute sprints with quick 15-minute breaks keeps you sharp without burning out.

1h 15m / 15m

Classic 90

Your rhythm matches the textbook ultradian cycle. A 75-minute focus block followed by a 15-minute break fits you almost perfectly.

1h 40m / 20m

Marathoner

You settle in slowly and ride long waves of flow. Protecting 100-minute deep sessions with generous 20-minute breaks is where you do your best work.

Discover your rhythm

Answer four quick questions to find out whether you work best in short sprints, classic 90-minute blocks, or longer deep dives.

1 / 4

How long can you focus before your mind naturally wanders?

Practical ultradian rhythm tips

Small daily habits that help you ride the wave.

Work in cycles, not marathons

Block your calendar in 60-to-90-minute chunks instead of open-ended hours. Finishing on a natural high beats grinding past it.

Honour the dip

When focus blurs and you start re-reading sentences, don't push through — that's the trough. Step away for 10–20 minutes and come back fresh.

Move between cycles

A short walk, some stretching, or simply looking out a window resets attention and circulation better than another coffee.

Reset with your breath

Slow nasal breathing for two or three minutes between blocks calms the nervous system and sharpens the next round of focus.

Ready to design your day around your rhythm?

Personalised coaching can help you build focus-and-rest routines that match your natural cycles, your goals, and your real life.

Book a free session