To Sleep Perchance To Dream

I saw someone on tv, a scientist, posing the question " where does our consciousness go when we sleep?" his opinion was that we disappeared into oblivion in those hours.
When i sleep my dreams come and i am free to do and experience those things that are just not possible in the waking world.
Some mornings i wake with such a contented feeling because of my dreams and sometimes i wake up scared or angry but i feel it none the less.
Sleep and dreams allow us to be totally open to everything that the conscious mind, hence life, can sometimes force us to repress or tone down!
Where does my consciousness go when i sleep??
It changes each time i close my eyes and open my mind!
Never oblivion!