You may want to place pillows between your knees, under your head and neck, and behind your back. (breastmilkcounts.com)
Using the pregnancy pillow between your knees gives better hip, leg and back alignment. (littleangels.ie)
What often helps with more comfort during sleep is to put a common pillow between your knees while lying on your side as this can alleviate lower back pressure. (mommyedition.com)