I also think reality (universes, dimensions, what you will) is far beyond our imaginable capabilities too. Imagination seems to be key, but we aren't equipped to decipher.
But I've been in discussions elsewhere about some collective phenomenon that rankles me. Like my hearing or reading or seeing on TV that Frank Gorshin, the actor/comedian, died. I must have heard this back in the eighties or nineties, but I wasn't the only person I know who heard it then and believed it to be true. Except that he isn't dead, or he wasn't dead years later when he appeared in his last film. Heck, I think he's alive today. The memory of hearing of his death seemed very real so I never doubted it. I know people who believed the same of Gorhsin for years along with me.
In the past year or more, I'd also read that James Earl Jones died, but my memory, certainly more recent than that of Gorshin, is really fuzzy. I've argued with myself that Jones can't be dead because my memory is so strangely incomplete. Maybe just a dream? Welp, he ain't dead. But I'm not the only person to have thought they'd read or heard he'd died.
Even if these reports were only dreams, what are the odds I'd find other people who shared the same belief, even through dreaming?
I don't go into that nebulous parallel universe thing because dreams are strange enough for me, but oh, the questions.