I plan to speak with my dr about this but I was just wondering What sleeping position do you ladies use? My 23wks now and of course I can't sleep on my tummy. I'm uncomfortable on my sides. I always wake up extremely sore. I start off on my left side but always end up on my back because it's so much more comfortable. After reading online that it says it's best to sleep on your left side I try my best but I always end up on my back. Online says When you lie on your back, the weight of the pregnant uterus slows the return of blood to your heart, which reduces blood flow to the fetus. That means the baby is getting less oxygen and fewer nutrients.