• Pediatric sleep expert Jodi Mintdell notes "During the second half of pregnancy, avoid sleeping on your back, a position that puts the full weight of your uterus on your spine, back muscles, intestines, and the inferior vena cava (the vein that transports blood from your lower body to the heart)."

• "Back-sleeping can also put you at risk for backaches and hemorrhoids, inefficient digestion, and impaired breathing and circulation."