You can "get by" with a variety behaviors that have negative health impacts. In the case of sleep, attentiveness isn't the only measure. Sleep deprivation weak

You can "get by" with a variety behaviors that have negative health impacts. In the case of sleep, attentiveness isn't the only measure. Sleep deprivation weakens your immune system, lowers testosterone production, and so on. I don't see how being a "functional insomniac" is any more admirable than being a functional alcoholic?