Dreams, OBEs, NDEs, paranormal etc. are all independent of the brain; in fact, has nothing to do with the brain. Brain is your biological machine that the mind uses to reach out to the physical universe and need the physical aspect to function as well. Mind itself exits independent of the physical world and exists out of spacetime. Quantum mechanics will tell you that. Mainstream science is misleading. Current model cannot explain many things and won't be able to main things ever. because traditional science relies on data, measurement etc. The unseen universe works on a very different level. Mainstream science is only good for every day thing.