Monday's Riddle! A Place Wherever...

http://www.edwardgoreyhouse.org/Hello, Riddlers! Here's this week's puzzle. Can you guess the theme? It seems like a strange, fading memory ; ) Good luck! ~ F

It's completely dark, and then suddenly it's not. Awareness arises, and thought stirs the lot. Either coming to scare and give you a fright, or sending you sailing into a smooth, lovely night. This place, they say, could never be real. But, when the images shift your mind will reveal; what it is that's inside? or outside? or nowhere? It's all depends on the scene that you sew there. For, in your depth is where I dwell, bubbling up fully like the chime of a bell. Your eyes will close, and you will slumber. Forever I'm there to take you asunder. These pieces of you are all that I show- but in the wake of your life, I'm just what you know. 

What am I? 

I already gave you a clue! FEAR NOT THE UNEXPECTED