Well, those are called deja-vues.
Some people from this forum also get them from time to time.
My brother had a few deja-vues also.
So, don’t think you are alone…it is nothing paranormal.
About OBEs…yeah, we discuss about them here too.
OBEs haven’t been scientifically proven, but many people get them and I believe them.
I got many lucid dreams, but I never got an OBE.
And about the shadows…I think it’s very interesting.
You see, recently we had a discussion about that.
Here you can read about ‘‘shadow people’’.
Enjoy 
You will find this forum very friendly.