First let me explain how I have been told why you need to sleep. I have been told that a hormone is produced that makes you sleep and sleeping gets rid of it. After being 3 days without sleep you start getting halucinaions. There are other effects but finaly around 7-10 days with absolutly no sleep the hormone will spill into your bloodstream and into your organs and effectivly kill you.
Now for my question, I have heard from a hypnotist that 1 hour of hypnotism is = to 3 hours of sleep, and to me it seems you wouldn't be very refreshed after up to 5 hours of concesness while dreaming. So which is it is LD ing very refreshing or does it deprive you of sleep as if you were awake.