The goal is just plain wrong. You don't optimize to shorten ur sleep, u optimize to improve ur sleep and rest pattern which might happen to shorten ur sleep.

Totally agree with this. I'm surprised how even health professionals prescribe an average value as something to work towards. Heck, they even give the same 8 cups of water a day advice to 50 kg females and 90 kg males. What an absurdity. Anyways, people should find the optimal amount for them by observing the outcome.