Can pregnant women sleep on their backs?

Everyone has their preferred sleeping position. Some expectant mothers have long favored sleeping supine (on their back) even before pregnancy. Whether they can continue this practice during pregnancy depends on gestational age and duration of supine positioning.

During early pregnancy, sleeping supine is entirely safe. However, as gestation progresses and the fetus grows, the enlarging uterus may compress the body’s largest vein—the inferior vena cava—when lying flat on the back. This compression can lead to decreased blood pressure, resulting in supine hypotensive syndrome. In severe cases, it may even trigger placental abruption, endangering both mother and baby.

Therefore, after 20 weeks of gestation, pregnant women are advised to sleep predominantly in a lateral (side-lying) position. While many expectant mothers know that left-side sleeping is considered optimal, it is not necessary to maintain this position exclusively throughout pregnancy; right-side sleeping is also acceptable. Additionally, brief periods of supine positioning—such as up to 30 minutes—are generally safe.