I experience three different things that result in me kind of being a in a different reality and as a different person. One is flipping bipolar states from down to up, say. My personality completely changes. Different guy. Another is dissociation, which for me is more a way of trying to hide from something painful. The third is actual derealization, which in me is always a sign of psychosis. Dissociation and derealization can look similar from the outside, but the neurobiology is completely different. No comparison. That's it for me.