Folio 03Protect attention

Timed focus sessions

Work in short, protected blocks with real breaks between them.

Evidence recordPromising evidence

At a glance

The useful move

Choose a bounded session, protect one task, and take the planned break.

Make the task startable

A timer turns "study for a few hours" — vague, dread-inducing, easy to postpone — into "focus for 25 minutes," which you can start right now. The break at the end is part of the method, not a reward you have to earn: knowing it's coming makes the focus block easier to protect.

Choose a workable rhythm

The right block length is personal. Classic is 25 minutes on, 5 off; deep workers prefer 50/10; some days a 15-minute block is what's available, and that counts. If numbers ticking down make you anxious, hide them and watch the ring instead.

Protect one task

One honest rule: the block is single-task. The timer isn't magic — the no-switching is.

Practice in Sumi

Move from reading to doing

Start a Focus session nowRequires sign in · Sumi destination /app?focus=1

Research record

Sources behind this method

Follow the published work behind the evidence assessment and see why each source matters here.

  1. Understanding Effort Regulation: Comparing 'Pomodoro' Breaks and Self-Regulated Breaks

    Felicitas Biwer, Wisnu Wiradhany, Mirjam G. A. oude Egbrink, and Anique B. H. de Bruin · 2023 · British Journal of Educational Psychology

    In one day of real-life self-study, predetermined breaks reduced fatigue and distraction relative to self-selected breaks; the small study did not measure later retention or establish one optimal timer ratio.

  2. Brief and Rare Mental 'Breaks' Keep You Focused

    Atsunori Ariga and Alejandro Lleras · 2011 · Cognition

    The experiments support brief diversions as a way to reduce vigilance decline; they do not establish the branded 25/5 Pomodoro schedule.