I don't disagree with the premise (that blue light affects your brain chemistry and can keep you awake) of the article but it's all hand-wavy. My biggest quest

I don't disagree with the premise (that blue light affects your brain chemistry and can keep you awake) of the article but it's all hand-wavy. My biggest question is how this exec knows he's performing at his best - Has (sh)he tried poly-phasic sleep? Compared his/her output against working 10 hour days, etc. Sleeping 11 hours a night is too much for many people but even then, there are 13 waking hours. How much of that becomes your optimal work day?