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Spellman | 10 months ago

There are a very small minority that seem to have a genetic component requiring less sleep for them (4-6hr).

https://www.ucsf.edu/news/2018/03/410051/scientists-discover...

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warp|10 months ago

A subsequent study has not found any link between the ADRB1/DEC2/other gene mutations and various sleep conditions:

- https://pmc.ncbi.nlm.nih.gov/articles/PMC9499244/

I am incapable of sleeping more than about 5.5 hours (unless I'm severely sleep deprived). So to me it seems likely that FNSS (familial natural short sleep) is a thing, but more research is needed I guess.