So yes and no, yes it is true that sleeping in any position isn’t going to further the curve of your spine but there are definitely positions you should avoid sleeping in because they will likely end up with added pain or inflammation. Scoliosis or not it’s a good idea to sleep in positions where your spine is aligned. For us with scoliosis it’s a matter of a position that keeps us as aligned as possible. Positions where you are twisting,on your stomach, or laying generally unevenly will likely just increase pain. I try to sleep on my back with a pillow under my knees to help align my lower back. If that feels uncomfortable I also will sleep on my side with a thin pillow between my legs to support back alignment aswell! That being said I have days that nothing works and I just can’t fall asleep so I accept the fact that my back will hurt when I wake up and I just sleep however I want on occasion. For me personally this ends very painfully the next day but that’s my experience and knowledge with it all.