There is a concept from trauma research that is so useful it deserves to leave the clinic. Siegel (2020) called it the window of tolerance. The idea is simple enough to carry around with you and precise enough to change a week.
Inside your window, you can think. You can feel. You can hear what someone else is saying. You can hold more than one perspective in your mind at the same time (Siegel, 2023).
Outside your window, you can still do things. But the quality of what you do changes. Above the window, you are doing them on fire. Below the window, you are doing them on auto-pilot with the lights dimmed (Lanius et al., 2011).
Most of the difficulty people bring into therapy is not that their window is too small in principle. It is that their window has been narrower than usual for longer than they realised, and the strategies that served a wider window are not serving the narrower one.
A window, not a line
Many people picture regulation as a line -- calm on one side, stressed on the other. That picture is too flat.
Ogden et al. (2006), drawing on work that eventually became central to somatic and polyvagal-informed therapy, offered a more useful image. Imagine a band of activation (Ogden & Fisher, 2015). The floor of the band is sleep-level, minimal engagement. The ceiling of the band is intense, urgent, full-mobilisation. Between the floor and the ceiling is your window -- the range inside which you can still think, feel, and respond.
The window has a location and a width. Both move. Both matter (Corrigan et al., 2011; Gates & Shaw, 2024).
Some people have windows that sit high and narrow. They are activated by default, and small things tip them over the top. Other people have windows that sit low and narrow. They are under-activated by default, and small things drop them under the floor. A healthy window, for most people, is wider, sits in the middle, and moves through the day in response to what is actually happening -- rather than getting stuck at either end.
Four signs your window is narrower than it needs to be
From a depth-psychology perspective, a narrow window is not a character trait. It is a snapshot of what your nervous system is currently carrying. Research suggests that the width of your window changes with sleep, nutrition, relational safety, movement, and accumulated unresolved experience (Dana, 2021; Porges, 2022). Here are four signs people often miss.
One: small inputs produce disproportionate responses. A tone of voice that would normally register as neutral is suddenly intolerable. A minor scheduling change feels like a personal slight. An email that a month ago you would have closed and reopened later now loops in your head for an hour. The problem is not the input. The problem is the width of the window the input is landing in (Schore, 2019).
Two: your range of emotion compresses. You notice you have not laughed out loud in a few weeks, or you have not been moved to tears by something moving. The inner landscape has gone a bit grey. This is different from clinical depression -- it is usually faster to shift. But many people notice that when the window narrows, the range of feelings it can hold narrows first (Nijenhuis, 2017).
Three: the things that used to regulate you stop working. Exercise feels like effort, not release. A walk by the water is fine but does not settle anything. Conversation with a close friend is good but does not come home with you. One way to understand this is that the regulators are pitched for a wider window than you currently have; they need either more time, or a gentler starting point, or a different order of operations (Payne et al., 2015).
Four: you start to feel like you are watching your own life from a step back. This is a kind of low-grade depersonalisation, and it is surprisingly common. Many people describe it as going through the motions, or being on the outside of my own week. It is almost always a sign that the nervous system is managing more load than it can integrate, and has quietly started running a skeleton crew.
What widens a window
If you recognise some of these signs, the useful move is almost never to try harder. Trying harder usually narrows a window. Five things tend to widen it, and they are all less dramatic than we might hope.
- Sleep that actually happens. Not performative sleep hygiene, just the basic arithmetic of enough hours in the dark.
- Contact with bodies other than your own. A handshake, a hug that lasts longer than the social minimum, a dog on a lap, a group of people in a room you do not have to perform in. Porges (2022) would point to the ventral vagal circuit here; the lay version is that nervous systems regulate each other, not just themselves.
- Movement at a pace your body actually wants. Not prescribed exercise, not optimised exercise -- movement your body asks for (Payne et al., 2015).
- Small, tolerable doses of the thing you have been avoiding. van der Kolk (2014) noted that avoidance narrows the window; not-avoided exposure, in tolerable doses, widens it. The emphasis is on tolerable (Kain & Terrell, 2018).
- A witness. This is why therapy works, for many people, even when no technique is being applied. The felt presence of someone who can sit with you without needing to fix anything is, for a narrow window, a structural resource.
A week-long experiment
You might consider noticing the width of your window three times a day for a week. Not trying to change it. Just noticing.
Morning, midday, evening. Ten seconds. Ask: Is my window wider, narrower, or about the same as usual?
Some people find the noticing itself widens the window, because noticing requires the observer part of the mind, and engaging the observer part tends to bring you back inside the window.
Some people find that the noticing reveals a pattern -- that the window is narrow at specific times, or in specific rooms, or after specific conversations. That pattern is information. It tells you something about what your system is actually carrying, and about where the load is concentrated.
And some people find that the noticing reveals that the window has been narrow for a long time. If that is what it reveals, the next step is not to widen it alone. It is to widen it in the presence of someone who can hold a steady witness while you do.
This is educational writing, not a substitute for individualised clinical care in a therapeutic relationship. If what you notice feels heavier than this short piece can hold, professional support is the appropriate next step.