The heart sits slightly to the left side of the chest. Sleeping on that side is sometimes perceived as more natural for the body, since there’s no direct pressure on that area. It’s also the position often recommended to pregnant women after a certain stage, as it’s generally considered more comfortable and reassuring.
Comparison with other positions
On your back: comfortable for some people, but less ideal if you snore or wake up with a dry mouth.
On your right side: perfectly acceptable, but sometimes less comfortable after a meal.
On your stomach: often discouraged for neck and back comfort.
The key is to listen to your body. There’s no universally perfect position—only the one that helps you rest and recover best.
How to switch to your left side without forcing it
If you’re not used to sleeping on that side, there’s no need to force yourself to stay there all night. Simply start by settling into that position as you fall asleep. You can also use pillows behind your back or in front of you to help you stay there longer.
And don’t worry: changing sides during the night is completely normal. Even a few hours on your left side can already make a difference.