I’ve always wondered if our brains had the ability to create pocket universes. For example, dreams. What if every dream you had was a window to a small pocket universe that actually exists for the duration of the dream? In the waking world, each train of thought that passes through one’s mind is a pocket universe branched off a possible future path.
Furthermore, the length of each train of thought defines how long that possible future can exist. This has implications in the theory of infinite parallel universes because it can limit the lifetime of the different parallel paths. In other words, some of the possible parallel futures cannot proceed past a define-able point.