I believe that we travel in and out of other worlds. We appear, vanish, die and daydream ourselves away from our universe, or galaxy. Who knows what is really going on with all this. But I feel certain that what we think does not come out of the blue and there is enough literature, fiction, history and speculation about the nature of universes or multiverses to give my notion substance, if not validation.
In one of my fictional works, the following passage describes a mysterious disappearance that is a kind of time/space travel. It pertains to a person whose parents vanished:
Recollection flooded Liera. He had heard the concert that played only once before, the night prior to his parents’ disappearance. It was the final evening of his summer holiday and his mother and father had taken him to hear the Antarctic Rim Symphony that was on tour in New New York. The next morning, he returned to the Academy, one of the finest boarding schools in the Second Rim. Seven days later the Director summoned him and told him that he had been classified as an orphan.
“What do you mean my parents disappeared. People do not disappear,” Ira shouted.
But people do disappear. The real questions are what happens next and where were they before they appeared.
See New New York, 3000 Years Later by Irina Gajjar.