Sleep is so important, how much do you sleep each night?
I don't get that much sleep because I work and go to school but sleep is natral thing it helps the body and mind
It used to be the norm to sleep in two shifts
Yea I know but its different from beinging awake by decreasing your abiltiy to certain stimuli
Do you find your concentration is increaded with more than 6 hours sleep?
Yes, I do. I know that I am in a deep sleep because I am dreaming. 
Have you experienced split sleep dream pattterns?
Yes. This may be due to the body in an anobolic state