Sleeping on the left side is still the position far better than all of the other sleep positions in terms of the benefits it has on our bodily health. It can help us digest better and easier. It improves the overall digestive system by allowing the body to extract nutrients and dispose of toxins faster and more efficiently, but it also affects our circulation and cardiovascular health because the heart is better able to pump downhill and the blood circulates more efficiently back to the heart.
It may reduce heartburn
It bolsters lymphatic system
So with this proper digestion and a healthy diet you can make a way out of obesity eventually. Apart from sleeping on your left side you should be trained to get a grip on sleep on your back as well!
The best position is to sleep on your back, and if you can, without a pillow to raise your neck. This way the mattress supports your spine equally and there are no pressure points on your body.
If you cannot sleep on your back, or suffer from apnea, then sleeping on your left side is supposed to help improve your circulation, and ease heartburn. Doctors will often counsel pregnant women to sleep on their left side.
However, you’re likely to have a physical preference for sleeping on one side or another, so sleep however you are most likely to get a good, restful night.
As a practice one should sleep on back. Sleeping on one side need pillow of slightly well stuff pillow otherwise person may suffer neckache. Secondly, if your stomach is full lying right side down will be uncomfortable. If stomach is not empty then laying left side down is OK because if you sleep on back then keeping legs straight may be uncomfortable at that time sleeping on left side is comfortable.