I used to maintain 8% for years in my early 20s. I'm not sure what I am now because I lift heavier so probably put on some muscle but It's super hard to get that skinny now my hunger just forces me to do it. (I also used to maintain it by pounding coffee). My libido was still really high though at that level I guess because very little estrogen too from the low amounts of fat. I like the way my face looks when I'm skinny way more then just being huge. My sleep is pretty good these days but if I do the amount of coffee that I did back then my sleep often suffers.