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Optimal or not there are plenty of people in society who are doing just fine on <6hr of sleep every night.

The results kind of speak for themselves. These people have jobs, families and generally productive lives like everyone else. If these people felt the extra sleep made their lives better than the extra time to do stuff they'd probably sleep more.

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Yes, but they are deficient in many aspects without realizing it. For example, Alzheimers is almost certainly a condition caused by chronic sleep deprivation. The results don't speak for themselves at all. Read Matthew Walkers book and you'll have a better understanding of why we need 8 hours of sleep, and anyone saying otherwise is frankly misinformed.

I usually sleep around 6hrs on workdays. I need around 3-4 coffee / day, but not more :) I usually go to bed at around 2-3AM and wake at 8:30AM.

I can manage a job, side projects, girlfriend and social life. I'm not sure when will it hit back if it will ever.

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