The best sleeping position for pregnant women is usually on their side, particularly the left side. This position enhances blood flow to the placenta, kidneys, and uterus, optimizing oxygen and nutrient delivery to the baby. It also helps reduce swelling, alleviates back and hip pain, and prevents the uterus from pressing on major blood vessels. Placing a pillow between your legs and under your belly can provide additional support and enhance comfort while side sleeping. Remember to consult your healthcare provider for personalized recommendations based on your pregnancy and health circumstances.