There are no ergonomic benefits to sleeping on your stomach. On the contrary, it’s a sleeping position you should preferably try to avoid. When you lie on your stomach, it can be a symptom that a mattress is either too firm or too soft and thus does not fit your body.
“The body is not built to lie on your stomach for an entire night.”
– Peter, Category Manager, JYSK
If you are lying on your stomach, it may therefore be a good idea to investigate the possibilities of investing in another mattress.