A helpful way to make sense of this comes from a psychological idea known as the window of tolerance. This concept, coined by Dan Seigal, describes the range within which we feel able to cope with life’s ups and downs. When we’re inside this window, our nervous system is relatively steady. We can think clearly, manage our emotions, and respond to situations in a considered way rather than reacting on impulse. There’s often a sense of being present, grounded, and capable—even when things aren’t easy.

At times, though, life places demands on us that stretch beyond what our system can comfortably hold. Stress, difficult experiences, or ongoing pressures can push us outside this window in different ways.

Sometimes, we move into a state of overwhelm. This is when the nervous system becomes highly activated—often described as a fight-or-flight response. You might feel anxious or on edge, find your thoughts racing, or notice yourself becoming irritable or easily overwhelmed. Sleep and concentration can be affected, and it may feel hard to switch off. In these moments, your body is responding as though there is a threat to deal with, even if the “threat” is the accumulation of everyday stress.

At other times, the shift goes in the opposite direction. Instead of overwhelm, you might experience a sense of shutdown. This can feel like emotional numbness, low energy, or a kind of disconnection from yourself or others. Motivation may be hard to find, and withdrawing from things or people can feel like the easiest option. In this state, the nervous system is trying to protect you in a different way—by conserving energy and dampening intensity.

If any of this feels familiar, it doesn’t mean there is something wrong with you. These responses are part of how our nervous systems are designed to protect us. Over time, and especially through repeated stress or difficult life experiences, our window of tolerance can become narrower. This can make it easier to slip into overwhelm or shutdown, sometimes without fully understanding why.

Therapy can offer a supportive space to gently explore these patterns. It can help you begin to recognise when you’re moving outside your window, understand what might be triggering these shifts, and develop ways to bring yourself back toward a sense of balance. With time, many people find their window of tolerance begins to widen, making everyday life feel more manageable and less reactive.

If you often find yourself caught between feeling overwhelmed and shutting down, you’re not alone in this. These are deeply human responses, and they can change. With the right support, it’s possible to feel more steady, more connected, and more in control of your emotional world.

If this resonates with you, you’re very welcome to reach out and begin a conversation at your own pace.