This is good news for some of you. The issue is which one of us is part of the lucky gene pool who only needs four to five hours sleep? https://www.thebrighterside.news/post/is-the-quality-or-quantity-of-your-sleep-more-important
This is very different from Matt Walker’s research which claims a different number. There was also his famous commentary that less than 7 hours of sleep per night, and your testicles start to shrink, which is certainly an attention grabbing comment. https://www.universityofcalifornia.edu/news/lack-sleep-shrinks-mens-testicles
There was also a recent paper that concluded 6 ½ hours of sleep per night is optimal. This not surprising given the huge variability in every other aspect of humanity.