Earlier quoted context omitted.
> they are widely known to be geniuses or hyper-productive (Nikola Tesla, Elon Musk etc.) I don't buy this. I don't know life of Nikola Tesla, but the recent activity of Elon Musk might be explained by a serious and chronic lack of sleep.
Short Sleepers certainly exist, but they're rare. https://www.ucsf.edu/news/2019/08/415261/after-10-year-searc... But I've usually heard of them needing ~4 hours of sleep, not 2.
But yeah I don't buy the 2 hour sleep thing, because according to this teacher it's almost always around 4 hours for people in this boat.