Technically the term is 'hyperlordosis' but most everyone I met uses 'Lordosis' as in you have a lordosis, since sway, saddle, and saddle backs are all slightly different, though I don't remember how off the top of my head. But, for instance, one is sticking your butt out way far, and another is walking around with a pelvic thrust like in a Transformer's comic.
It probably comes from trying to match stylistically to the 'opposite' Kyphosis, which is hunchback. (There is also hyperkyphosis.) Technically, the normal throatic curve is known as the kyphotic curve as well. So *shrug* language in action?
Speaking of not being able to sleep on your side: I can't sleep on my left side, but I can on my right, which has resulted in my right side being more stretched/stretchable than my left.
Okay. That makes sense @DregsandDregs. I asked because I wasn't sure and I have been diagnosed with lordosis in the c-spine. But even then the doctor didn't properly explain it to me and I've been told so many different things with my neck.
Laying on my left side is more comfortable physically, but for some reason my brain doesn't really like it or I am just compulsive about being on my right side. However, I have the opposite problem. My left shoulder is far more flexible than my right -- which is stiff and aches often from laying on it. I try not to fall asleep on my side though.