Sleeping on your back makes it easier for our head, neck, and spine to align and keep in in a neutral position which means no extra pressure or curves are being added to the back. Place a pillow under your knees to help maintain the normal curve of your lower back. You can also try placing a small rolled towel or a pillow under the small of your back for additional support.
The comfort and pain reduction you experience from any sleeping position may be increased through the use of a well-suited pillow.
Doing a variety of different stretches in bed each evening can also help to reduce back pain – learn more here