As in the dream you had while sleeping.
Mine had me seeing the sky distort and turn into some sort of dimensional rift. I remember seeing black goo falling from the sky and seeing a large, sandstone ceiling cover everything. Just beyond the reach of clouds I saw a rocky ceiling with square holes in them that lead into the darkness of space. Then, after getting lost in an ancient pyramid, the sky then turned into planets phasing into one another. Like textures in a video game overlapping one another. I saw lights in the sky flying around like fireflies and hearing a voice saying “You’re quarantined on this planet. You may not leave but we can.”
This is a long one. I used to have very frequent, intense, vivid dreams when I was younger, and this one stands out even among those. I had this dream when I was in my mid-20s, and 30 years later I still remember it like it was yesterday.
I dreamed about these monsters called blood-bats that were ~3’ tall, squat, red-skinned, winged monsters with 3 big black claws on each hand. They would claw people and leave long, white lines on their flesh, draining them of blood and also the will to live. I dreamed I had gone to Marrakesh (for some reason) and the streets were filled with people who all had these marks on their arms or chest or whatever, and they were all just shuffling around like they were zombies, staring at the ground, etc. They were all kind of moving in one direction, so I pushed through the crowd in that direction and eventually discovered a palace that appeared to be their destination. Inside the palace was this long, wide great hall that was lined by these little booths that each had a priest of some religion or other in it. The people were all lining up to go into the booth of their choosing where they would kneel on a small carpet, the priest would bless them, and they would collapse and a pair of orderlies would put them in a body bag and carry them away.
I was determined to find out what was really going on here, why all these people appeared to be grimly shuffling off to their ultimate demise, so I skipped out of the line and found myself in an elevator. As the elevator started going down one of the creatures came in through the hatch in the ceiling and attacked me, but I managed to fight it off without getting clawed and it fled. Pretty soon the elevator stopped and the door opened and I found myself in this vast open warehouse-like structure filled with thousands of hospital beds, each one with one of these creatures on it. There was an old man pushing a cart around from bed to bed checking on them. I approached and asked him what the shit was going on and he explained that these creatures were from another dimension, that they traveled between dimensions hunting sapient life to drain as a food source. The way they hop dimensions is they make someone where they want to go dream about them - usually only a few at most - and then when that person wakes up the ones they dreamed of would exist in that reality.
As soon as the old man finished telling me this I realized that I was dreaming and was about to wake up, only I wasn’t dreaming about 3-4 of these guys, I was dreaming about the entire race. In those hazy few seconds between being fully engaged in the dream and fully awake I was frantically searching around both the dreamscape and my bedroom for anything sharp that I could use to kill myself before I woke up and brought all of them here. Fortunately reality reasserted itself in pretty short order, but that handful of seconds might’ve been the most scared I’ve ever been.
Even weirder, several years after I had this dream a friend of mine described, without having heard about mine, a dream he had once had that featured virtually identical creatures, but in his dream they were torturing people in dentist’s offices and shit. Kinda freaked me out.