From Wikipedia (09/01/26), in line with being inclusive/open : https://en.wikipedia.org/wiki/Dream

“A dream is a succession of images, dynamic scenes and situations, ideas, emotions, and sensations that usually occur involuntarily in the mind during certain stages of sleep.[1] Humans spend more than two hours dreaming per night,[2] and each dream lasts around 5–20 minutes.[3]” (Note: I have had dreams lasting about just under an hour, and chain dreams where you wake up and dive back into the same dream to continue where you left off. My record for the latter was about 5 unbroken re-entries, followed by a long period of sleep afterwhich I was almost late for a work shift) — Meryl)

“The human dream experience and what to make of it has undergone sizable shifts over the course of history.[10][11]”

"Dreaming and sleep are intertwined. Dreams occur mainly in the rapid-eye movement (REM) stage of sleep—when brain activity is high and resembles that of being awake.”

“In Old English, the word drēam was used to describe "noise", "joy", or "music" …”

(Meryl’s note: sorry, stepping in here, the writing from there was just a bit too ESL for the brain i.e. WHAT are you trying to SAY)

…but when the Norse blokes and babes rolled in back in the day, they also steamrolled over the original meaning. While ushering in their new era, they also apparently decided that the ancient rave parties of days yonder were an absolute no-go. Their verdict: Throw out the entire orchestra of noise and joy and music, out with the old guard party rockers. From that day henceforth, “dream” was only to mean .. uh.. whatever it was in that first paragraph of this section, plucked from wiki on 09/01/26. Basically, a bunch of visions with nothing. ‘WooOOooOOoo, a ghost cup’. And that was that, all forgotten, no one knew any the wiser — until recently I guess. Sounds just about right, right? :p *foghorn sax farts, donkey antics and the band* *clop clop clop clop