It could have been a false awakening. Sometimes you really truely think you wake up, when in reality it is just a vivid dream.

And also, for choosing a different scenario, I would practise that from now on! learn how to change Dreamscapes as much as possible =]

I'm no expert, I just joined and I'm still very new (as you can see) but from reading and taking in all the things on this website and from Lucid Dreamers themselves, I believe those two things I told you would probably have come up =P. Oh yeah, this site IS awesome too lmao =P