This topic reminds me of a cartoon. The Hubble Telescope cost billions to build and operate for a decade, and due to a flaw in a reflective mirror it wasn't producing quality photographs of deep space.
Politicians were angry and threatening to defund the hubble telescope program. The cartoon showed a half dozen scientists sitting at a table discussing the problem, when one of them says
"maybe deep space really is blurry and fuzzy?". Someone went up in a shuttle and made repairs, and now the photographs from the hubble are truly out of this world.
My dreaming has changed significantly over the decades. Come to think of it, everything has changed significantly over the decades. Aging is much more than the simple passing of time.
From my experience, your body and mind undergo significant biological changes. They can occur so slowly as to be nearly imperceptible. Passions, and memories undergo shifts in intensity and clarity.
I used to have very entertaining dreams. I looked forward to sleep and the experience of dreaming. I would start out reading a book on the environment I wanted to enter in my dreams, and I would segue into it as
I fell asleep. I don't miss the repetitive dreams of looking for my next high school classroom and endlessly
walking the halls of my high school trying to figure out where I am supposed to be, and feeling anxious about being late. lol
I remember seeing a list of common repetitive dreams and what they meant. I had been experiencing a couple of them. Regrets can manifest themselves in your dreams.