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i think for the vast majority of people, sleeping 4 hours is a very, very bad idea. there are some genetic outliers that do seem to function just fine on very little sleep, they are rare tough.
Russians used to say how Lenin only slept 4 hours per night because he was so dedicated to the revolution, but look what happened to him, stroke and invalid at 51
Sadhguru sleeps 4 hours per night and he is healthier than 95% of people his age.
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that's an N of one. like saying my grandad was a smoker and lived to 100, thus smoking is good.
that being said, I'm not the sleep police and if you are sleeping less and feeling good and have good health markers etc, then that's great
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