What are the odds?

About 1 in 1.
maybe 1 in 2, but closer to 1 in 1.

(the ones who deny this just don't remember their dreams)

There are great problems with putting dreams onto the silver screen.

• in a dream, you "know" the history. when showing it to others, they do not know.
• your dream space is not linear, so it is really hard to film a scene that you see as surrounding you, and place it on a flat rectangle.
• There are many emotions conveyed to you by what you are experiencing, we have no technology for that yet. We get by with using music and characters emoting.

Anyway, film makers are a very special kind of person that takes their dreams and figures out a way to put it all into a little rectangle.