My old ex-classmate appeared in a dream after I saw him for about 2 seconds

So yeah like a title says, I was driving car when I saw my classmate (not close friend, just classmate) from primary [~10 years ago] school drove against me. I noticed him for two seconds passing my car on the road. Then I though about him for like 2 minutes.

This short event caused his manifestation into my dream that night. If I knew, it would be a effective dream sign. Also when I compared it to hours of reality checking, dream signs visualization or dream incubation, it would be very neat to understand what causes his appearance and the concept of dream creating.

My idea is that I've spend a lot of time in class with those classmates and my subconscious is still filled with these memories. Seeing him was a trigger to my young subconscious part.

No doubt. I have dreams with people from my high school quite often (and I'm 9 years removed)... although part of that is because I see them on Facebook too. Certainly seeing someone you haven't in a while churns up a lot of memories.

i too have experienced something similar. i put some sheets around my bed that are thumbtacked into the ceiling to block out the bright light of an exit sign while i try to sleep. the night i put it up, i had it only a few minutes, fell asleep, and bam it was there set up in my dream. looked as though i had a false awakening and it was still set up exactly as i had done the first time that night.

There is a topic which can answer to your question: http://www.dreamviews.com/general-lu...ends-luck.html

I'm often surprised at how trivial the impressions are in WL that can result in "day residue" effects in dreams. Sometimes it's just a random scene in a movie that I didn't pay any attention to at the time, occasionally transformed almost beyond recognitiion. If you actually saw a real person you know and were like, "omg, it's that guy!" even for two seconds, I'm not surprised it would manifest in your dreams later.