text:  as a result of the brain being perturbed. Most commonly, we've already talked about perturbation with drugs, and not just psychedelic drugs, but also drugs like amphetamines and cocaine. But you can also get hallucinations in states of stress, and exhaustion is a good one, because the brain cannot put together all the information it's getting to create the normal sense of the world, which is what your brain is doing. Your brain is actually creating a model of the world all the time.