Nervous system resource

Understanding your window of tolerance

The Window of Tolerance, a concept developed by Dr Daniel Siegel, describes the zone in which you can stay present enough to think, feel, and respond with some balance. When you move outside that window, your nervous system may shift into overwhelm or shutdown.

If this happens to you, it does not mean you are failing or being difficult. It usually means your body is trying to protect you in the best way it knows how.

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Within your window

Steady enough to think, feel, and respond

  • You can feel emotions without being taken over by them.
  • You are more likely to feel flexible, grounded, and able to take things in.
  • You may still feel stress, but it is more manageable.

Above your window

Hyperarousal: your system moves into alarm

  • You might feel anxious, angry, panicky, rushed, or on edge.
  • Your body may want to fight, flee, argue, fix, or escape.
  • Thinking clearly can become harder when survival energy takes over.

Below your window

Hypoarousal: your system moves toward shutdown

  • You might feel numb, disconnected, foggy, heavy, or far away.
  • You may want to hide, sleep, switch off, or stop engaging.
  • It can feel hard to care, act, or stay present.

A simple visual

What it can look like in everyday life

This visual can help make sense of why stress may feel manageable at one time and completely overwhelming at another. Trauma, long-term stress, and difficult early experiences can narrow the window, so it takes less for you to feel thrown off balance.

The encouraging part is that the window is not fixed. With awareness, practice, and support, it can widen over time.

Infographic showing hyperarousal above, the window of tolerance in the middle, and hypoarousal below.
Visual reference from NICABM, included here as a psychoeducational support for clients.

First step

Notice what happens in you

One of the most helpful skills is learning to spot when you are moving toward the edge of your window. This is where self-monitoring can become compassionate rather than critical.

Try SIFT

  • Sensations: What do you notice in your body?
  • Images: What pictures, memories, or impressions are showing up?
  • Feelings: What emotions are here right now?
  • Thoughts: What is your mind saying?

In the moment

A gentle reset when you feel off balance

  1. 1. Pause and orient. Look around the room and name five things you can see. Let your body register that you are here, now.
  2. 2. Name what is happening. Try a phrase such as, "I am getting overwhelmed" or "Part of me is starting to shut down."
  3. 3. Support your body. Slow your breath, place your feet on the floor, sip water, or move in a way that helps you feel more present.

Building capacity

How the window can widen over time

Widening your window does not usually happen by pushing through. It happens through repeated experiences of noticing, regulating, and recovering with enough safety and support.

Notice the early signs

Learn the clues that tell you you are nearing the edge of your window. You might notice a tight jaw, shallow breathing, a racing heart, blankness, or losing words.

SIFT what is happening

Pause and gently check in with Sensations, Images, Feelings, and Thoughts. Naming what is happening often brings a little more steadiness and choice.

Use breath and the body

Slow breathing, sipping water, stretching, shaking out your hands, or swaying can help your nervous system shift out of overwhelm or collapse.

Name it to tame it

Simple words can help. Saying to yourself, 'I am feeling anxious' or 'I am starting to shut down' can reduce the intensity and help you orient.

Bring in support

Co-regulation matters. A calm, attuned relationship with a therapist or trusted person can help your system feel safer and expand what becomes tolerable over time.

Practice at the edge, gently

Widening your window usually happens gradually. The aim is not to force yourself, but to build capacity in small, manageable moments of challenge and recovery.

A compassionate reminder

Regulation is not perfection

The goal is not to stay calm all the time. The goal is to recognise what is happening, respond with more care, and return to yourself more easily.

Over time, states of steadiness can become more familiar traits. That is part of how healing deepens.

Support

You do not have to do this alone

Many people find it easier to work with the edges of their window in therapy, where experiences can be approached slowly, safely, and with attuned support.

If this resource resonates, you are welcome to bring it into our work together.

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