It is often recommended for you to sleep on your right side. Why, simply because if you sleep in your left side, it will only cause more burden for your heart. Remember that at the same time your heart is circulating the blood to all over your body. So by sleeping on your left side, it will only cause more pressure for your heart.

Sleeping in your left side will also make you relax, and calming your nostril. This is good for your mental. Of course, the best sleep way is with your back.