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Autobiographical work written by people with autism displays a type of crisis authors tends to call “sensory overload.” This crisis involves moments when sensory processing, already known to be an issue in autism, is dramatically disturbed, leading to an agonistic feeling. First, we will describe a sensory overload crisis in order to differentiate it from other type of crisis that can be seen when supporting people with autism. Then we will analyze the testimony of a person with autism who describes how she lives through such a crisis. This phenomenological approach allows us to investigate how the crisis unfolds. From this, we will put forward a psychoanalytical point of view about the processes that are undermined in these moments when perception is deconstructed. Finally, we will address the question of the “sensory becoming psychic matter,” examining how sensory input becomes part of a subject’s global psychic functioning. We will consider contributions from sensory motor approaches, in order to find out what this testimony can help us further understand about psychic functioning and the effect on object construction within relationships.