Just a thought.

What if sometimes when you're sleep you're not actually sleep but conscious in another body but you're unaware that you are? 

Hear me out: Think about it. What if we never sleep but what we think is sleep is actually us taking consciousness of another body but we have no memory of doing so? Dreams could actually be what our brain in the body we left is trying to process while we're absent from it. Why do you think sometimes we wake up rejuvenated, sad, mad, etc.? Is it because we had a good sleep or maybe we had that emotion before leaving the other body and returning to our own?

I've had experiences like this. It's hard to explain but sometimes when I'm dreaming and I look at a reflection I don't see myself. I see someone else. Sometimes it's the same person but often times it's someone completely different. The first time I can remember this happening was in 2011 sometime after my 16th birthday. I was walking downtown holding a briefcase just walking. The sidewalk never ended. I had no idea where I was going. There was no destination. Just walking. I looked at the glass of a building and I saw that I was an older white male, roughly around the age of 50, wearing a top hat and a black and white suit. 

But that's not the first time I've had a dream of me being him. The other dreams aren't as vivid as that one was but from what I do remember is that it's the same guy. 

I will keep you guys updated as I have other experiences about this.