If you’re interested in the many ways to explain the Mandela Effect, Dr. Fred Alan Wolf is someone to listen to, as you’re looking for answers that make sense to you.
Whether you agree with him or not, he offers some interesting observations that may be part of this puzzle.
In this excerpt from a 2010 interview, he talks about reality and dreaming. Though his most relevant dream theories start at about the 6:36 point, to understand the concepts best, watch this entire YouTube video.
(Some of those concepts are echoed in his Flatland video.)
To learn more about some of Dr. Wolf’s theories and their connection with science, see his paper, The Dreaming Universe – Q&A
And, to delve more deeply into the quantum theories related to this, see his early, simple thesis, Dreaming Universe Paper.
In addition, the following book by Dr. Wolf is fairly old (1994), but I think it’s important to explore the history of an evolving theory, to more fully understand it. So, if you can find this book at your public library or snag a copy for a couple of dollars, it could be worthwhile… if you’re exploring the dream/reality connection from a quantum angle.