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If you typically sleep on your back, it's safe to continue doing so through the first trimester. But as your uterus gets heavier around mid-pregnancy, it's best to choose another position.
When you lie on your back, the weight of your uterus presses on the major vein that returns blood from your lower body to your heart. Lying on your back for an extended period of time could make you feel dizzy. It could also interfere with the flow of blood and nutrients to the placenta and your developing baby.
This is particularly a problem if you have a condition like high blood pressure or diabetes that affects how much oxygen and nutrients the baby is getting.
Try to train yourself to sleep on your side or sitting propped up. If you sleep on your side, put a pillow behind your back or in front of your chest so that you can lean back or forward. A pillow between your legs can also help make side sleeping more comfortable.
Don't be alarmed if you go to sleep on your side and wake up flat on your back. It happens all the time and shouldn't have any serious adverse effect on your baby's health. Just shift your position and go back to sleep.