It's like an alternate reality or something. I mean, different personas? I'm pretty sure there were times when I took the role of someone other than myself in dreams, but it's never been the same character twice. I don't think my dreams have ever picked up where they left off, except perhaps when I wake up and quickly drift off again.
Almost all of my dreams take place in the same world (I call it Neo-America because it's a warped version of the northeast US), a point proven by driving, biking, walking, or flying to locations of past dreams. There are 4 recurring dream personas - in addition to Regular Rob and White Rob, there is 30s White Rob and Vincent Drake. 30s White Rob is a relatively new character, only been around for the past several years. I don't know that much about 30s White Rob other than he's some kind of engineer, is extremely good with math, and lives near the coast on a hill with a dirt road.
Vincent Drake is my oldest character and the only person I was able to dream as for years and years and years. My dreams used to be so dangerous that only a supernatural person could survive them. Drake has developed many defense mechanisms for nightmare survival, including respawning. Normally, when you die or are about to die in a dream, you automatically wake up. When killed as Drake, I do not wake up, but just respawn. I can fly, teleport, shoot lightning out of my hands, airbend, and drag enemies into a limbo state between life and death. These require only a quick, less than a second power-up. There are two ways to do that last ability, both myself and my target must die together/at the same time. We both emerge into an area of darkness, where they start to experience intense physical pain and hallucinate, and I just leave them there and respawn. This sounds awesome, except dying kind of...hurts. Drake has died 16 times and each one of them has been exceptionally painful. I don't recommend. In addition to these abilities, Drake can morph into an undead form, which is visually frightening to whoever is looking, can become temporarily invisible by trying to teleport through a solid object, is always in perfect health, and does not ever fatigue unless using power.
While White Rob is not usually supernatural, if a regular dream turns into a nightmare on him, he can gain the ability to fly or jump very high via event triggers. The trigger for flight is to be chased by someone or something to at least a 2nd floor window, and then jump out at the last second. The trigger for long/high jumping is to be chased to a cliff or other natural height, and jump off that. If there is no immediate danger, and he jumps from one of those places, he will fall and die, ending the dream and waking me up. Unlike Drake, White Rob must maintain flight manually by flapping his arms. He is at the mercy of wind currents, downdrafts, and the such. Some creatures are able to jump very high and try to snatch him out of the air. Some dreams get so bad that I see everyone on the ground dying, there is never a safe place to land, and I am stuck needing to maintain flight until the dream peters out or I am woken up externally.
Regular Rob doesn't stand much of a chance in a nightmare, this is my least favorite person to be stuck as. Regular Rob does get a bit of luck, though. I survived a total zombie apocalypse by hiding with some other survivors in an elevator. Everyone else in the building had their bodies audibly ripped apart and devoured alive, but no one found us until late. We won by some kind of event glitch where a sufficient number of survivors could turn zombies back into humans just by crowding them. We turned the ones that attacked us, but eventually there were no humans or zombies left, everyone had died and we walked out apparently being the last people on earth, never found other survivors.
30s White Rob has yet to encounter a nightmare. Any dream can, in theory, turn if the right event trigger is pulled. Looking deep into dark woods, looking into a mirror, being worried about something going wrong, chasing after pets that run away, driving at night, and going anywhere at night are known event triggers. A few things can turn a nightmare back into a regular dream, such as searching for seashells, picking up a water/nerf gun, going into a store and browsing items with the intent to buy something, and Drake respawning after a death. Common nightmares include zombies, black creatures with red eyes that shred people apart, being chased by fox-like things that come out of the woods, massive tidal waves, multiple direct hits by EF5 tornadoes, being stuck in the open during intensely powerful super thunderstorms, being hunted by AI and police, home invasions, deadly diseases spreading through cities, and plane crashes.
There are also "super nightmares", which involve any kind of threat against what appears to be Real Rob in the real world. These happen during a standard lucid dream. After having trouble trying to lucid dream, I discovered two event triggers that start a lucid dream with a 100% success rate. Falling asleep with your head arched back, like over a couch arm, will send you to sleep paralysis and to a lucid dream if you can hang on without waking up during the sensation. Once on the edge of awake/asleep, I can also just think about the word "lucid" and it immediately starts. I went in and out of sleep paralysis 21 times in a row in rapid succession the night I discovered this trigger to prove its effectiveness. However, the risk of super nightmares makes it too dangerous to try lucid dreaming for real.
It was more like a ghost or something. Whatever it was, it was a heckuva lot scarier than the black riders.
You probably encountered the "demon". Many people have run-ins with a dark figure that stalks them, hovers over them, comes out of a mirror, comes into their room, etc. It's completely harmless in a regular dream, other than the dreamer having a bad nightmare. However, if it comes out in a lucid dream, it can attack your paralyzed body in what appears to be the real world. There can be "others". THAT
is a super nightmare!
I encountered this thing in one of the worst ways possible, about a year ago. Lookup the "3 Kings" or "Midnight Game" on Reddit. They are similar activities where you bring yourself to the awake/asleep border and try to achieve astral projection, which is a thing, and it can go horribly wrong. 3 Kings looks like internet bullshit, but it's definitely real. People have actually had to move out of their house after trying this and having it go bad. An internet friend dared me to do this and I pussied out.
However, like a week later, I had a dream where Regular Rob setup the 3 Kings. I didn't do it all right and ended up looking into the mirror. I saw my reflection move independently of myself, then take the form of some random person, who snarled at me. I got scared, which made them transform into the all-black demon, which started physically coming out of the mirror at me. I was so fucking shocked that I practically fell through sleep paralysis and into a lucid dream. I opened my eyes and was lying in bed in my room in the real world, but the demon was standing there in my room staring at me. The combined fear and shock was finally enough that I woke up, but lacking enough energy to remain awake, I fell asleep again and straight back into lucidity. The demon was still there and it started moving toward me and I was so fucking scared, but Vincent Drake came out of nowhere and beat the demon back until it fled. As in, I watched my own dream persona defend me as his own separate person, acting of his own accord, in my own room. I then woke up again and stayed awake. I haven't tried lucid dreaming since!