The Window of Tolerance – understanding stress, emotions, and behaviour

I often talk about the Window of Tolerance in my work with young people, but it’s a concept that’s just as relevant for adults. The idea comes from trauma research and has been popularized by Dr. Dan Siegel, who explains it as the zone where our nervous system feels regulated enough to cope. When we’re inside it, we can think clearly, communicate, learn, and manage our emotions effectively.

When stress builds — particularly for those who have experienced trauma — we can be pushed outside of this window.

🔺 Hyperarousal
This might show up as anxiety, irritability, panic, or racing thoughts.

🔻 Hypoarousal
This can look like withdrawal, numbness, shutdown, fatigue, or feeling disconnected.

These responses aren’t signs of weakness or “poor behaviour”. They’re your nervous system doing its job — trying to protect you.

Understanding this framework can be empowering, whether you’re a young person learning about your feelings, a parent supporting a child, or an adult noticing your own stress responses.

The aim isn’t to stay inside our window at all times (that’s unrealistic). The aim is to notice when we’re outside it, understand what helps us return and gradually widen our capacity to cope over time.

When we understand what’s happening beneath the behaviour, we create space for compassion — for ourselves and for others.