4. Supports the Lymphatic System
The lymphatic system is a network of vessels that carry a clear fluid called lymph. This system plays a key role in moving fluid throughout the body, and also in our immune function. Lymph can carry away toxins and other waste products, so a blockage anywhere in the system is associated with poor health.
It has long been thought that sleeping on the right side of the body helps the lymphatic system filter out waste. Lymph drains to the right through the thoracic duct, so once again, this position lets gravity assist a natural bodily function.