Theories of human sleep still seem very speculative. I sometimes wonder if there's some function of sleep that's essential to higher intelligence. And if AGIs would need a similar function? 
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Sleep itself would ostensibly seem to be a severe disadvantage and so less is surely better? But maybe it’s just somehow not as bad as it seems. (Or maybe it’s all more complicated, e.g. “less sleep” trait interferes poorly with certain neurodegenerative condition genes, etc.)
Seems like there's lots of speculation on this. One interesting theory is that it's related to immune response, eg: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2631508/ …pic.twitter.com/6l54bXd8Sh
