The Window of Tolerance

What this is

About the workbook

A two-page printable guide to the window of tolerance — psychiatrist Dr. Dan Siegel's term, from his 1999 book The Developing Mind, for the zone where you're alert enough to respond but settled enough to think, feel, and choose at the same time. Stress, poor sleep, pain, and past trauma can all narrow that zone.

Page one explains the two directions people go when pushed outside the window — hyperarousal (pounding heart, racing thoughts, irritability, panic) and hypoarousal (numbness, fog, heaviness, shutting down) — in plain language, with recognisable body signs for each. It also names the quiet, functional version of shutdown: still working and answering messages while everything feels distant and harder than it should.

What the window of tolerance is

Some days you can handle a rough email, a tense conversation, a long wait — not enjoy them, but handle them. Other days the very same things send you into a spin, or flatten you completely. Psychiatrist Dr. Dan Siegel coined a phrase for this in his 1999 book The Developing Mind: the window of tolerance — the zone where you're alert enough to respond but settled enough to think, feel, and choose at the same time. Everyone has such a band, and stress, poor sleep, pain, and especially past trauma can narrow it.

Outside the window, people go one of two ways. Above it sits hyperarousal — the accelerator: pounding heart, fast shallow breathing, racing thoughts, snappiness, waves of panic, lying wired at night while exhausted. Below it sits hypoarousal — the brake pulled hard: numbness, fog, heavy limbs, a quiet voice, feeling like you are watching your life through glass. The handout is plain that neither direction is weakness; both are the body's protection systems doing their job a little too thoroughly.

It also names the version most lists miss: the quiet, functional shutdown — still working, still answering messages, while everything feels distant and harder than it should. Looking fine on the outside, the handout notes, is not the same as being inside your window.

What is on the two pages

Page one teaches the vocabulary: where the term comes from, the two lists of hyperarousal and hypoarousal signs to mark against your own experience, and a short how-to-use box whose advice sets the tone — practise the skills while you are still inside the window, because a skill rehearsed when you are calm-ish is far easier to reach when you are not. The goal, it says, is not to never leave the window — everyone leaves it — but to notice sooner and have a way back.

Page two is the practice half. A fill-in section maps your own earliest signs — body first, behaviour second, thoughts last, because the earlier the sign you catch, the smaller the skill you need — along with what pushes you out and what has helped you come back before. Then five concrete ways back inside: lengthening the exhale to roughly six breaths a minute, citing Sylvain Laborde and colleagues' 2022 pooled review in Neuroscience & Biobehavioral Reviews; the physiological sigh, citing Melis Yilmaz Balban and colleagues' 2023 randomized study in Cell Reports Medicine; the 5-4-3-2-1 orienting skill done slowly enough to actually look around; a move-before-you-reason route up out of shutdown — palms pressed hard into a wall, walking to another room, saying today's date out loud; and DBT's cool-water skill from psychologist Marsha Linehan, carrying its full safety caveats — skip it with a heart condition, an irregular heartbeat, a very low resting heart rate, or an eating disorder, and never pair it with holding your breath.

How it pairs with therapy

The handout is deliberately a between-sessions practice rather than a substitute for the work itself. Its own framing of trauma-focused therapy is worth repeating: the work happens deliberately at the edges of the window, so that the window can stretch without flooding you past it. That is a good one-line description of how approaches like EMDR and trauma-focused counselling pace themselves — enough activation to work with, never so much that the nervous system tips into the very states the two lists describe.

It is also why the fill-in page matters more than the printed lists. The lists are everyone's signs; the fill-in section is yours — which shoulder rises first, which conversations reliably push you out, what has actually brought you back before. People who arrive at a first session with even a rough version of that map give their therapist a running start, because catching an early body sign is a smaller, kinder task than recovering from a full spiral.

Print it, fill it in over an ordinary week rather than in one sitting, and bring it along if you decide to book the free 15 minute consultation — it is a perfectly good way to say a lot in fifteen minutes. The closing section is honest about limits: if you are outside your window most days, or the swings trace back to things that happened to you, that deserves real support rather than a worksheet.

Where it fits in the library

This handout is the vocabulary piece of a small nervous-system pair: Calm Your Body's Alarm System is the companion sheet, with six calming practices graded by evidence — the two overlap deliberately on slow breathing and the physiological sigh, so the skills you map here are the same ones you rehearse there. If the swings you are mapping trace back to particular events, the Trauma Recovery Workbook goes deeper on the same territory this page introduces, and the Sleep and Rest Toolkit picks up the wired-at-night sign that sits at the bottom of the hyperarousal list.

A practical note on printing: the fill-in page is the half that earns its keep, and it belongs on paper, filled in over several ordinary days rather than from memory in one sitting. Signs noticed in the moment — a jaw that sets during a particular meeting, fog that arrives mid-afternoon — are more accurate than signs recalled later, and the differences between what you would have guessed and what you actually recorded are usually the interesting part.

Like everything in this library, it is educational material rather than therapy, it is free to share as long as it is not sold, and it carries Canadian crisis lines — 9-8-8 by call or text anywhere in the country, and 1-800-SUICIDE in British Columbia.

This workbook is educational. It is not therapy, not an assessment, and nothing in it is a diagnosis. If you are in immediate danger, call 911. In Canada, the Suicide Crisis Helpline can be reached by calling or texting 988, at any hour.

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If you want to go further

Working on this with someone

A workbook can take you a surprising distance on its own. If you would rather not do it alone, TEO offers virtual therapy in British Columbia, Ontario, Alberta, Saskatchewan, Manitoba, and Newfoundland & Labrador — evenings and weekends, with a free 15 minute consultation first and no obligation afterward.

Related: Trauma therapy.

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