Window of tolerance

The “window of tolerance” (a term from Dan Siegel) is the range of arousal where you can handle what you feel and still think, connect, and function. Inside it you're okay — alert or calm, but coping. Above it you're flooded (panic, rage, overwhelm); below it you shut down (numb, foggy, frozen). Trauma tends to narrow the window, so it takes less to get knocked out of it, and longer to get back.

• inside: present, able to think and feel at once
• above: racing, panicky, flooded
• below: numb, heavy, shut down
• frequent swings between the two

• “I went from fine to overwhelmed in a second”
• “I keep bouncing between too much and nothing”
• judging yourself for not handling things “normally”

A nervous system shaped by chronic threat is more easily tipped out of balance — both the brake and the accelerator are touchy. So the window where you feel steady is smaller, and ordinary stressors others absorb can push you over or under. This isn't fragility; it's a system calibrated by what it survived.

• expecting yourself to have everyone else's window
• pushing through when you're already outside it
• shame about the size of your window (it can widen)

• learning your own edges — what tips you up into flooding or down into shutdown
• regulating back in: down-regulate when flooded (long exhale), gently up-regulate when shut down (movement, orienting)
• widening the window slowly, through repeated regulation and trauma-informed work