When sleeping on your side, should you face right or left? Which is better?

I remember my mother often saying when I was a child, 'It's better to lie on your right side after eating,' and 'Because food enters the stomach from the left and exits to the right, lying on your right side is better for digestion.' So, I often slept on my right side, but I became curious if lying on the left side was bad.
This is because I sometimes sleep on my left side.

However, it seems there are cases where lying on the left side, meaning with your left side down, is actually better.

According to a diagram from the same site, this is how it works.

Due to the structure of the stomach, it says that stomach acid can easily reflux into the esophagus.

So, what should you do? This site explained it in an easy-to-understand way.

For healthy people, the muscle at the junction between the stomach and the esophagus works properly, making reflux less likely.

I wondered if my mother was wrong, but it turns out her advice was correct for me since I am healthy.

Also, lying on your right side not only aids digestion but also seems to reduce the burden on the autonomic nervous system, improving sleep quality. Furthermore, having the right side down and the left side up means the heart, which is on the left, is positioned higher, which also reduces the strain on the heart.

For those concerned about acid reflux, it seems better to lie on the left side. Additionally, lying on the left side is said to improve lymph flow, making it easier for toxins and waste products to be eliminated from the body. Lying on the left side seems good when you are concerned about swelling.

Regardless of whether you lie on your right or left side, sleeping on your side has the benefit of making it harder to snore. This is because when sleeping on your back, the tongue can block the airway, which easily leads to sleep apnea syndrome.
I'm sure some of you have experienced this. I am one of those people myself.

The height of your pillow is also a key point for improving sleep quality. According to Nishikawa, a bedding company, it looks like this.

Choosing a pillow with the appropriate height for yourself and sleeping in a position that feels comfortable according to your physical condition is, in the end, the best way to get a good night's sleep.

I'm not sure if this is helpful, as it ended up being a 'So it doesn't matter which one!' kind of result, but thank you for reading.
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