Our health is affected by the way we sleep. Every stream of natural sciences has a solution on “How to sleep for best results”. Ayurveda propagates sleeping to your left as it is supposed to improve blood circulation and help in better functioning of organs, keeping you healthy and looking young. It is referred to as “Vamkukshi”.
In Islamic culture, sleeping on the right, especially in the early stage of sleep, is recommended according to the teachings of Prophet Muhammad. In their ritual book it says to perform ablution like that for the prayer whenever you go to bed, and lie on your right side. It is stated in the Hadith that the Prophet puts his right hand under his cheek when he wants to go to sleep.
Modern scientific studies have also shown the benefits of sleeping on the right side, especially for the heart. In particular, one study, “Comparison of Effect of 5 Recumbent Positions on Autonomic Nervous Modulation in Patients With Coronary Artery Disease,
”after experimenting on healthy subjects made to sleep in three different positions, it came to the conclusion that for the heart it is best to sleep in the right lateral position