Our brains are constantly taking in information: Sounds. Light. Movement. Smells. Voices. For many people, the brain filters some of this information, allowing certain things to fade into the background.
For many neurodivergent people, this can work differently. More of these sensations may remain present at the same time – and some may be experienced more intensely. A room can suddenly feel full. Too full. Too loud. Too bright. Too much movement. Everything at once.
The nervous system tries to process it all. But at some point, it can become too much. Some people become restless. Others become very quiet. Some need to leave. Others stay where they are – but withdraw into themselves.
This is not a choice. And it is not “wrong” behaviour. It is the nervous system responding to more than it can process at that moment.
Sometimes the world isn't too loud – the nervous system is simply too full.