I think there are probably a lot of us who have had experiences like that. We don't say much about it because each individual has different experiences, and they only have specific meaning to that person. That kind of experience can cause one to search endlessly for the meaning, but a better route is to do meditation and pranayama practices (main lessons link above).
While this won't necessarily give one the answer to their meaning, it does fairly soon give one the definite feeling that it is the path leading in the same direction as those visions were trying to lead to. So meditation doesn't give what your ego wanted, but it gives what your heart wanted, and so is much more satisfying in the long term.
i had many of these kind of visions a long time ago. One time I was under a street light at night, and tried a technique I had read about to see "other-worldly things", crossing my eyes slightly. Suddenly I could see the 60hz blinking of the streetlight, and at the same time I felt that I had become that frequency, and if I just let go, I would leave this world and enter another one. I decided that wasn't a good idea, for fear of leaving an insane remnant of myself here, so I closed my eyes, shook my head and moved out of the streetlight.
Another time i had the flu, and was walking through the woods, and felt the presence of a great, underground light. I felt I knew exactly where it was, a few hundred feet away, and I knew what it looked like, a multi-colored crystalline, underground room, and if I walked into it, everything in my world would change. I decided I shoulden't go there because I was sick and weak, so I avoided it. Another time I woke up in the middle of the night, and saw a spider descending from above me on a web, kicking it's legs as it lowered itself. But it was no ordinary spider. It was pitch black in the room, and this spider gave off light of every color as it moved. It scared me, and i moved out of the way, and turned the light on, and there was nothing there.
OK Jonjon, now you shouldn't feel hesitant to say anything!
i bet everyone here has stuff like that they don't talk about.
Mainly because all the stories tell you is there is spiritual energy in you, and meditation is the way to pursue it. Thanks for bringing it up; it's fun to remember things like that.