What are backward dreams about?

Typing another dream this morning, I figured I would post a dream I had back in 2000 that is just as clear to me now as it was then. Very short. I was on a train. Standing on the outside platform of the back car (caboose?) Looking backward. The scenery is not Earth. It's a red planet, looking more like Mars based on pictures I have seen. I can see the mountains and desolate rocky terrain. No other vegetation, animals, or people. It's flying by in a blur because this train is traveling at warp speed. The speed is so great all i can hear is a howling sound. I know there is no destination but to just keep traveling. But as I'm looking back I can see I am being chased (I am the only one on the train and there is no engineer) by a massive demonic looking reptilian creature. I kept gaining distance on the train. But I never went inside the train cars. I just stood staring at the creature. I will never forget it and that dream has never left me. I can still hear it and see it. I've lost none of it 21 years later.

I walked up the cobblestone driveway to a massive mansion/castle. I remember there were 2 menacing looking lion statues, midway up a short staircase leading to the large doors; which were incredibly intricate with designs and foreign looking writing on them that was emanating a dull light.

I pushed open the doors and there was a grand high ceiling entrance with a sparkling crystal chandelier, and windows in the back with clouds visible in the distance. But next, what came into focus was a tall slender woman with long hair, who was turned around, looking out the window.

As I moved closer she began to turn around, and before I could make out a face I noticed her chin was folding up over her forehead. The motion continued and her body began to arch backward in an unnatural way, and began morphing and folding into itself and shrinking until it finally took the form of a baby.

The baby had claws/birdlike talons, and next thing I knew there was a loud screech and it was crawling toward me super fast, and then I woke up.

\-- This dream still kind of haunts me just because it seemed so incredibly real, and the entity seemed so evil to me.

When I was very young about 5 or 6 I had this dream that I was walking on ice and there was a pattern I had to follow in order to not fall through it. There would be thick ice and I would be able to walk on it no problem and then thin ice which I had very little time to walk across it. The pattern would go thick ice thin ice and would repeat. I was about to get to the end and I saw a gold/bronze-like statue of a man sitting on a throne. I was fixated on the statue so I chose that's my target to go next. I started to walk on the ice and I was almost there only 1 more ice sheet to go. However, I slipped and fell backward onto the thin ice and started to fall into a bottomless void with blue light gazing through the hole I fell through. I Could see myself falling down but I wasn't moving it was like the dream had paused and I had a distant view of myself and I was a black silhouette. I could hear my screams echoing. I woke up and was very scared and confused as to what had just happened. I remember one thing specifically in the dream I could feel how cold it was in the air and the ice wasn't lake ice it was like a pathway you would have for pavement.

I always had my Spotify on when I'm about to sleep, I was listening to Christmas jazz music until It played backward, it sounded diabolical and that's when I knew that I was dreaming, it felt like it transitioned from reality to a dream in a matter of seconds. The sound that my Spotify was making was creepy and all I could do about it is ignore it. That was until I felt my skin burning like there were thousands of needles piercing through my skin. I opened my eyes with such terror and to my surprise, I see no fire. The environment and my surroundings were hell-like, I couldn't do anything about the horrendous pain I was feeling but scream and roll over on the ground. I leaned over my wall asking for someone's help but there was no one there to help me. It wasn't only physical pain but also emotional pain, I felt like I had gone through depression, anxiety, and many other mental illnesses. It felt like I was being tortured. I looked outside my window and everything was bright orange. In my bed, I saw my cousin using his phone, I tried getting his attention but to him, it seemed like I wasn't even there. I walked outside my bedroom very slowly, it felt like there were chains of balls attached to both of my legs. I checked my parents' bedroom but no one was there. I walked down the stairs only to see our static television and the eerie noise, it's making. As soon as I took my final step, the dream looped. Every detail I mentioned in this story was repeated over a thousand times. It felt like I was there for over many years. When my mother woke me up for school, I thought that I was still dreaming. For a millisecond, I could still feel the agonizing pain. my body was so numb but it only lasted for 2 seconds. I was so thankful for her that she woke me up.

I am a college-aged guy. I had a dream that I was at my university's library. There were so many people around, and I started to feel overwhelmed. I felt woozy, like I was going to faint. I started falling backward into an elevator that was going down. The elevator was full of blonde people wearing white. (I have black hair)

Right before I could fall into it, a girl who looked a couple years older than me grabbed me by my shirt collar. She was wearing a black suit, and she looked very stern and serious. She was also very good-looking, and she had dark hair. She grabbed my hand and pulled me back up. She grabbed me again by my collar and shook me a little bit, stared right into my eyes and said "cmon, get your shit together!" As soon as she said this, the dream ended.