03/09/2026
Sleeping on your left side has been shown to be incredibly beneficial for the body with, in my opinion, the most incredible benefit being the facilitating of lymphatic drainage.
The lymphatic system has a dominant flow toward the left side of the body, where the majority of the lymphatic fluid drains into the thoracic duct, the thoracic duct then drains into the left side of the heart, left internal jugular vein and the left subclavian vein.
Sleeping on your left side allows gravity to assist in the drainage of lymphatic fluid making the process more efficient. By better facilitating lymphatic drainage, sleeping on your left side improves the function of the lymph nodes, which act as filters in the lymphatic system, trapping and destroying foreign substances like bacteria and cancer cells.
The lymph nodes also play a crucial role in the body by housing and activating lymphocytes, which are white blood cells that fight infection and disease.
Research also shows that sleeping on the left side enhances the glymphatic system, which helps clear waste from the brain, reducing risk of neurodegenerative diseases.
Sleeping on your left side improves blood circulation by preventing pressure on the vena cava, the body’s largest vein. This position allows for better blood flow to the heart and organs, especially the liver and kidneys and is also extremely beneficial during pregnancy.
Also, sleeping on your left side improves liver function by keeping pressure off the liver, improving blood flow and aiding the body’s natural detoxification processes.
PMID: 33212927, See also Daniel Martin Simadibrata et al. World J Clin Cases. 2023; Ozcan Ozeke et al. Sleep Breath. 2012 Sep.
