It is generally recommended for pregnant women to avoid sleeping flat on their backs after the first trimester due to potential complications like reduced blood flow and increased pressure on major blood vessels. However, sleeping in an upright position with a continental pillow supporting your back can be a suitable alternative. This position helps alleviate discomfort and allows for better breathing. If you find yourself getting tired of sitting and prefer sleeping on your side, that is perfectly fine as well. Side-sleeping is generally considered the best position during pregnancy as it improves circulation and reduces the risk of stillbirth. To enhance comfort while side-sleeping, consider using a pregnancy pillow or placing pillows between your knees and under your belly for support. Remember to consult with your healthcare provider for personalized advice based on your specific circumstances.