Restful sleep is essential for both physical and mental health.
With a certain body position, it is possible to relieve back pain and reduce pressure.
Sleeping on the side
If you like to sleep in this position, it is recommended to place a pillow between your legs.
Sleeping on back
If you are lying on your back, put a pillow under your knee. The pillow should also be placed under the neck.
Sleeping on the stomach
Sleeping in this style is a serious challenge for the back, and unlike you, it doesn't do much for the spine. If possible, choose another pose.
Despite the recommendation, if you still cannot comfortably fit in another position and must lie on your stomach, then place the pillow in the lower abdomen and hip area. If your back is not stretched too much and you do not feel discomfort, you can put your head on a pillow.
Source:
https://www.mayoclinic.org/diseases-conditions/back-pain/in-depth/sleeping-positions/art-20546852