Dream Within a Dream

I had a scary dream the other night. 

I dreamed that I was in some sort of guesthouse (apparently as an MK and now missionary, I've spent enough time in guesthouses that now I dream about it!).  I can't remember really what led up to the scary part, seems like it was a pretty normal dream about moving around in different rooms.

Then I went to a doorway and reached inside to turn on the light when wham! someone inside slammed the door hard on my arm.  It startled me so much that in my dream, I woke up startled and realized it was just a dream.

Then I woke up, heart pounding, and realized that I had been dreaming about waking up from a scary dream.

A dream within a dream.  Weird.