Hey there, Karuna!

I really know what you're talking about, I have that in almost all my dreams. Once I was running around in a university-building as myself, as the student I am, chased by the principal... And the next minute I was a Russian spy chased by my opponents, and fell into a fairy-tale book. xD
I'm not sure what causes these plot-twists, but I have them in almost every dream and I just wanted to let you know that I think it's a very normal happening.

Good luck with dreaming!