Why neurodivergent kids become overwhelmed, and what their nervous system is telling us
Issued by Lanham Media on behalf of LiveBig
For many parents of neurodivergent children, moments of overwhelm can feel like they come out of nowhere. A child may suddenly shut down, become highly anxious, or escalate quickly. Clinicians say these moments are often misunderstood, with what looks like behaviour instead reflecting a nervous system moving into survival mode.
“It can feel confusing for parents, because it looks unpredictable,” says Angela Sozzi, Psychology Lead at LiveBig, a national allied health provider supporting people with disability. “In many cases, the child’s nervous system has already registered that something is not safe, even if we cannot immediately see why.”
This pattern is not limited to children. The same responses are increasingly being recognised in adults, particularly neurodivergent adults who may have spent years trying to push through or mask these experiences.
A brain wired for survival
At the centre of this is the autonomic nervous system, which controls how the body responds to stress. The sympathetic system prepares the body for action, often described as fight or flight, while the parasympathetic system supports rest and recovery.
“When the brain detects a threat, whether real or perceived, the sympathetic nervous system takes over,” Angela says. “Adrenaline and cortisol are released, heart rate increases and the body prepares to act.”
For neurodivergent individuals, sensory input, change or unpredictability can be enough to activate that response, and baseline stress levels are often higher.
If that heightened state continues, the system can shift in the opposite direction. “When the body can’t stay in that heightened state, it can move into a shutdown response,” Angela says. “That can look like withdrawal, fatigue, or a child going quiet and disengaged.”
The concept of the window of tolerance helps explain this, describing the zone where a person can stay present and engaged, and outside of which the system shifts into survival. A person may become highly anxious and reactive, or withdraw and shut down, often before they have any capacity to reason or respond.
For neurodivergent people, that window is often narrower and highly individual, with triggers ranging from sensory overload to changes in routine or unpredictable environments.
This understanding is driving a broader shift in how behaviour is approached. Rather than focusing on managing behaviour, clinicians are increasingly looking at what is happening underneath. Instead of asking “How do we stop this?”, the focus becomes “What state is this nervous system in, and what does it need to feel safe again?”
“It takes the pressure off,” Angela says. “This is not about someone doing the wrong thing. It is about a body responding to stress in the way it is designed to.”
What actually helps in the moment
When someone is outside their window of tolerance, reasoning or instructions are unlikely to be effective. Support needs to work with the nervous system, not against it, and should be guided by whether the person is in a heightened (hyperaroused) state or a shutdown (hypoaroused) state.
“The quickest way to shift the system is through the body, not the mind,” Angela says. In a heightened state, the focus is on slowing and calming the system. In a shutdown state, the goal is to gently re-engage it. The same strategy will not work for both.
Practical strategies need to be targeted and matched to what the nervous system is doing in the moment.
This can include:
• Paced breathing, such as slowing the breath (for example in for 4, out for 6), to signal safety to the body and bring it out of a stress response
• Shaping the sensory environment, by dimming lights, reducing noise, or stepping away from busy spaces when someone is overwhelmed, or introducing movement like walking, bouncing a ball, or using a weighted blanket to help re-engage a shutdown system
• Grounding through the senses, such as noticing five things you can see, four you can touch, three you can hear, two you can smell and one you can taste, to bring attention back into the present
• Using strong sensory anchors, like holding an ice cube, splashing cold water on the face, chewing something sour, or using essential oils, to improve relaxation and calmness or improve attention and energy.
The aim is not to stop the reaction, but to help the nervous system shift back toward safety and regulation. Once that happens, thinking, communication and engagement become possible again.
For providers like LiveBig, this shift from managing behaviour to supporting regulation is becoming central to how clinicians work with both children and adults.
“When we focus on supporting the nervous system, rather than controlling what we see on the surface, regulation improves naturally,” Angela says. “It is not about fixing the person. It is about supporting them to feel safe enough to engage with the world. “
ENDS
Issued by Lanham Media on behalf of LiveBig.
Media Contacts:
Greg Townley | [email protected] | 0414 195 908
Fleur Townley | [email protected] | 0405 278 758
Media Assets available here
Available for interview:
- Angela Sozzi, LiveBig Team Leader - Psychology. Angela is a registered psychologist and member of Australian Association of Psychologists with more than 20 years of experience in helping children, teenagers and adults with complex mental health presentations and neurodevelopmental disorders in various educational and clinical settings.
About LiveBig
LiveBig is a specialist allied health and assessment services provider for people with disability, including those on the NDIS. LiveBig is registered with the NDIS Quality and Safeguards Commission. LiveBig simplifies the process of accessing support services at home, via telehealth, and in the community. LiveBig is part of the Arriba Group, which includes Rehab Management, AimBig Employment, and LiveBig. For more information, visit www.livebig.com.au.