An interesting thing I learned in my first pregnancy is that it’s recommended that you sleep on your left side while pregnant. Why? Because your liver is on the right side of your body. Laying on your left side helps keep your uterus off that large organ, which takes the pressure off your liver and also your kidneys. This means more room to function properly, helping with swelling issues in your hands, ankles, and feet.
Sleeping on your left side also improves circulation to the heart and allows for better blood flow to the fetus, uterus, and kidneys. This is because your inferior vena cava (IVC), which is a large vein, runs parallel to your spin on the right side of your body.
If left is ideal, should you avoid sleeping on your right? No. It’s safe to sleep on your right. And depending on where your placenta attaches, it may actually be more comfortable. There’s a very slight risk of compression issues with the IVC when you sleep on the right, but it’s very slight. It just comes down to what’s more comfortable for you.