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3 doctors weighed in: When during pregnancy should you stop laying on your back? 3 doctors weighed in Want a second opinion? At approximately 24 weeks you should avoid laying on your back for prolonged periods of time in order to avoid compression of veins (vena cava). In brief: 6 months.
Sleep however you feel comfortable. Lying on your back after around 16 weeks of pregnancy can be uncomfortable, and later on can also mean that your womb presses on one of the main blood vessels. This can make you feel faint. Sleeping on your side might be more comfortable.