Optimum sleep is achieved at a trough (even double trough) of your circadian cycles,
and when your body has nothing to digest. It can differ from person to person,
but a common double trough is between 2130 and 2200. Your body will fall into healing
sleep alot faster catching a trough. Another common trough is 1500. (SIESTA!!)
Anything over around 7-8 hours is dead sleep - regen is done. It is possible to attain
maximum mind/body regen in significantly less than this but the peaks and troughs must be followed-
meaning having broken sleeping patterns over the 24 hour period.
I do not know the content of this posted video - but i know my written paragraph to be true