When you sleep on your left side, you contribute to the health of many of your organs, since it makes their work easier. Among other functions, you improve your circulation and digestion.
Not surprisingly, the rise of processed foods, brainless entertainment and lack of physical activity has caused our sleep quality to drastically decline. You may not remember now, but both the stomach and the pancreas are mostly on the left side of our body. If our sleeping position is on this side, we favor better digestion. It is a way to better channel the gastric juices and more easily promote the secretion of pancreatic enzymes. Thus it helps the digestion work little by little, instead of all at once, such as often happens when we sleep on the right side.