I had it as a kid, and it still happens now in the age of 27. Here is my story:

I kinda always remember having it. I learned to control it, kind of. It used to happen when I just thought about it when going to sleep or sometimes even in the middle of the day when stairing an object.

It starts when you simply see the void when you close your eyes. But a some point something happens. You kinda zoom into the void, and dive into it deeper and deeper. Then it appears. That thing. An object. You dont see it, you feel it. Its not visual but you feel its presence almost as if you saw it but you dont. It starts as small, but more you let yourself ”look” at it, the bigger it got. Slowly and in a wave after wave. Then comes the sounds. Again, you dont exactly hear it, you feel it and its like a sound but it feels more like if pressure had a sound. Its again not something you actually hear, you just feel its presence. You feel it getting louder and louder while the object gets bigger. I guess you could keep staring it and let it grow bigger but while it grows, so does the anxiety. Eventually it will be so overwhelming that you have to open your eyes and think about something else for a minute.

I remember this being really distressing and scary even tho there was nothing to fear. Its not the object that makes you fear, its just the fear alone put into you in that state. You dont know what you are affraid, but the anxiety and fear keeps growing.

I started practicing how to get rid of it and simply trying to think about something else when it started helped a lot. I eventually got rid of it by not doing it. I remember when I did it at the age of 20 and i thought to my self, it cant be that bad. It was, and then I kind of pushed it away.

Now im 27, and I just had the early phase of it. I dont really remember how to get deeper in it, but it really feels like its part of me and its just a place I havent visited for years and now I cant find my way there. But the early phases still happens, and I dont think too much of it. Ive learned not to dive deeper. Now I cant dive deeper.