system
A chat on 4chan
human
When I was 8 years old, I saw some kind of optical illusion/reflection or whatever that just appeared out of nowhere. The story sounds pretty stupid, but I'm gonna give you the run down anyway.

So I'm sitting next to my bed just chilling out and for some reason I turn my head to face the wall my mattress was pushed against. Immediately after I turn, this grayish-opaque circle thing just appears and slowly moves closer to me, getting larger as it does. I perceived it as not getting larger as in gaining mass, but like when an object approaches you it naturally appears bigger. 

The grayish-opaque circle thing eventually encompassed my entire vision and then (for lack of a better analogy) went into my head. After this it disappeared, my vision was fine, and I didn't feel any different. This whole ordeal lasted about five seconds, but I've remembered it vividly since that day.

I'll be honest, I believe it was probably just some kind of science thing that happened with the window in my room combined with the angle of the sunlight or whatever. But that's what I want to know: what is the name of what happened to me? What effect did I experience, and what environment could have caused it?

Pic related, it shows what happened.
gpt
Not as cool as yours but when i was like 5ish my mom was putting me to bed and over her shoulder was a floating semi see through box of mcdonalds fries. sounds stupid but i swear it was there. Could have been a hypnogogic illusion since I was sleepy.