This time I write it.
It was late night, I was in bed, my bedroom completely dark, I was trying to sleep, turned to the left on my bed, very close to being asleep. Some time later I am staring at darkness like I'm suspended in nothing, there is only darkness, all around me, completely black, darker than my dark bedroom, and I'm there but without a body, only me and my vision. A moment later, a circular opening starts growing in the middle of the darkness, a perfect circle out of nothing, it grows until it's wide enough, maybe 1.5 meters wide, or less. It's a tunnel, I can see something on the other side, it's not much of a tunnel, only long enough, maybe 7 meters long. It's stable, perfect, there is no wall around it, it's made of darkness as well somewhow but distinct, and no movement other than when it opened. Soon after I'm taken forward into the tunnel until I reach the other side. Now I'm inside a room, it looked less long and wide than the length of the tunnel, the whole room was never available for me to look at. In front of me there was an elevated flat surface, behind that was a table and some chairs on the other side maybe, there's wasn't much space between them, that's how I remember it, but it may have been only a table. Behind the table I think some space and then a wall. The walls were some sort of dirty white, or white, it was a light color, and maybe the wall in front of me was a little curved, the wall to my right may have been as well. Don't remember any windows or doors. Don't remember any lights on the room. The room was not modern, didn't look like a house. Could have very well been a room underground. On the flat surface in front and below me there were papers, at least a big one in the middle, and around it 2 or 3 stacks of A4 paper or a little bigger. Then my vision is inclined down to that surface with the papers, and a big paper is placed close to my face. I can only look around. On the paper was something similar to a 3 4 5 triangle, shorter on the left, medium length on the bottom, longest at the top, longest line pointing to the right, and some curved line, there may have been some text under it. Then the paper is removed and the stacks of papers star being lifted by nothing, fast, sometimes a paper stops in front of my face, it's too close, then it's removed, and the stacks keep having papers being lifted fast, a few more placed right in front of my face, I can't remember what was in them. This happened fast. When all papers were lifted and either shown to me, or disappeared, my vision was inclined back to the middle of the room with the flat surface in front and below me. I looked around but didn't notice any more details. Then I am pulled back into the tunnel and taken to where I was at the beginning, soon after the tunnel closes exactly like it opened, the circular opening becomes smaller and smaller until it disappears, now there is only complete darkness again. A moment later I wake up, still in bed, my bedroom completely dark. The end.
This experience lasted close to 30 seconds, maybe less. The feeling was unique, like being taken on a ride, like being forced to experience it, I didn't do it, it came to me. There was never any bad feeling, it felt like something I haven't felt before or since, and I'd like to have an experience like that again.
Found one person who had a similar experience many years ago, but the tunnel was a spark that unfolded into a kaleidoscope of colors, and the papers were flashing red light, but the website where it was written was closed.
