That is a significant quality of life factor. It does vary by biology and (I assume) lifestyle factors as well, though. I generally feel about as rested on 7 ho

That is a significant quality of life factor. It does vary by biology and (I assume) lifestyle factors as well, though. I generally feel about as rested on 7 hours as 8; 6h and less starts to degrade exponentially, especially after more than one night. Any magic optimizing formula would certainly have to account for that subjective value. (Although, being tired can sometimes function as a desirable altered state of consciousness; it can be very satisfying to work on a creative project late into the night.)