Window of Tolerance

The arousal band where thinking and feeling can cooperate; outside it, you flip to fight, flight, fawn, or freeze.

Description

Coined by Dan Siegel. Inside the window, parts stay reachable and you can feel something and think about it at the same time. Above it, firefighters take the controls. Below it, everything goes flat and cooperative and nothing lands. The window widens with pacing, breath, movement, sleep, and other people.

The practical value is that it reframes what looks like resistance. Somebody who has gone quiet and agreeable is not necessarily on board — they may be under the window, and the session will feel smooth and achieve nothing. Similarly, a part that suddenly cannot be found often means you are outside the window, not that the part left.

Also worth knowing: your window is not one width. It is narrower when you are tired, hungry, ill, or three days into something hard, and treating yesterday’s capacity as today’s budget is how people overshoot.

What Window of Tolerance is NOT:

Not a fixed trait, and not the same as being calm — flat and agreeable is usually below the window rather than in it. And definitely not something to “try harder” at; effort narrows it.

Examples:

Stopping mid-story to get your feet on the floor before going on.
Standing up and walking around while talking with a part.
A shorter session, on purpose, because it is the one you can actually digest.

see also:

Titration; Co-regulation; Blending & Unblending; Protectors; Trailheads