When I read this, I had a weird feeling and I just had to check if I was dreaming . But yes, that's when it happens to me too (very rarely).Quote from DieHardDiabloFanOh, yeah, I get dreams within dreams quite often. It usually happen when I became aware that I'm dreaming.
Wow guys, this article is very interesting and seems to explain alot of things mentioned by multiple people in this thread, especially Umpa. I'm gonna have to try this (in fact, I think I already did this once without realising it).
Edit: it works. I haven't actually had a lucid dream from it, but I'm pretty sure it works because I got the exact same thing Umpa was describing and it frightened me so much that I just couldn't go through with it >.<