Sleeping on your left side is thought to have the greatest benefits for your overall health. Even so, either side can offer benefits in terms of sleep apnea and relief from chronic low back pain. You don't have to stay with one side all night. Feel free to start on the left side and see how your body feels.
Whether you should sleep on your right or left side depends on the health problems you face. The left side may provide more benefits, especially for women who are pregnant or experiencing gastroesophageal reflux disease (GERD). People with these conditions may want to take special care to sleep on their left side. However, people with heart failure may experience discomfort on the left side and instead prefer to sleep on their right side.
The side sleeping position is by far the most popular. Sleep scientists also know it as a lateral sleeping position. Resting on your side, with your back almost straight, can help reduce sleep apnea. It can also eliminate neck and back pain, as the spine stays aligned.
That said, sleeping on your back seems to be ideal for most people, followed by the left side and then the right side. Just try to avoid sleeping on your stomach if you can, as this can put unnecessary strain on your limbs, joints, and spine.