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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Replying to @michael_nielsen
It’s important to note (and recently discovered!) that jellyfish sleep, and they only have nerve nets: https://www.theatlantic.com/science/archive/2017/09/even-jellyfish-sleep/540432/ …
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