I've always been a stomach sleeper with one leg bent upwards. Recurring pain moved me to look into healthier sleeping positions. Moving forward I'm going to focus on side sleeping because it feels more natural to me than sleeping on my back and has other benefits - Good breathing airflow - Neck and back alignment - If you have heartburn the left side tends to be better - etc. I'm also going to add a small pillow between my knees to reduce pressure on the hips. https://www.sleepfoundation.org/sleeping-positions