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
One of the biggest mysteries to me is why some people need much less sleep without apparent adverse effects. Why didn’t evolution select for this trait?
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Replying to @michael_nielsen
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.)
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Replying to @patrickc @michael_nielsen
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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I have to admit that if you told me I had to spend 8 hours lying very still in the dark not saying anything and hoping not to be eaten, “just put me under, doc” would come pretty quickly.
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One of my fav insights about sleep is that growing children become taller primarily at night while incapacitated and horizontal. They eat a bunch and go to bed to lengthen, really. Perhaps it's too much to ask that this happen while fighting vertical gravity.
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"I'm going to lie down and elongate"
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