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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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
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ISTR an argument that a forced period of inactivity during the darkness helped avoid predators with better night vision. Doesn’t seem crazier to me than, eg, fight-or-flight.
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A problem with the predator theory is that some apex predators sleep a lot. Lions and tigers sleep 18-20 hours a day.
End of conversation
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