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Sleeping positions can be controlled more especially during pregnancy. One should be careful with what you should and shouldn't do, since some things could be potentially harmful to you and your baby. Pregnant women are advised not to sleep on their back from their 4th month of pregnancy because of anatomy.
When you sleep on your back after the first trimester of pregnancy, the weight of your uterus can decrease the blood flow in the vena cava. Vena Cava is the vein that carries blood from the lower part of your body to the heart. This could decrease the blood flow to your uterus where your foetus grows, which is risky.
After the 1st trimester, you are advised to sleep on your side, especially your left side since the Vena Cava runs slightly to the right of your spine. Human liver is also on the right side, so if you sleep on your left, the foetus won't compress the organ, allowing smooth flow of blood. Sleeping on your right is also not wrong, but doctors recommend the left side.
If you wake up and find yourself sleeping on your back, don't stress over it, but rather turn slowly and sleep on your side. When you're pregnant, back pains are normal due to the strain placed on your back when you sleep. To reduce the pain, you are advised to put a pillow in between your legs.