If you are struggling with back pain, try sleeping on your back with a small pillow under your knees. This position may help maintain the natural curve of your spin. You may also want to try sleeping on your side with a pillow between your knees to help take pressure off your lower back. A mattress topper for lower back pain will help you with this.If you are struggling with back pain, try sleeping on your back with a small pillow under your knees. This position may help maintain the natural curve of your spin. You may also want to try sleeping on your side with a pillow between your knees to help take pressure off your lower back. A mattress topper for lower back pain will help you with this.