Is it possible that the process of sleeping is just a period of time where the blood flows from our body to our brain...sort of like it's just a time period when oxygenated blood has a chance to flow to our brain because while we are moving around all day long blood is being pumped throughout the body and sleep is a chance for it to go to the brain.

If this is the case, then dreams would just be a byproduct of the oxygenation of nerve cells in the brain (producing the dream images we experience).

What do you guys think?

Any studies done on this?