There is no definitive answer to what side to sleep on for digestion, but some sleeping positions may help alleviate digestive issues. Here are some tips from the search results:
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Left-side sleeping: Some people believe that sleeping on their left side helps aid digestion because the stomachs natural position is on the left side, where it can digest food more effectively. Gravity also helps waste travel from the small intestine to the large intestine. Sleeping on the left side may also help reduce heartburn and acid reflux episodes.
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Elevating your head: Elevating your head while sleeping on your left side can improve nighttime digestion. Studies show that this position helps ease heartburn as the lower esophageal sphincter (LES) is kept above the level of gastric acid. In the event of reflux, the acid should go back quickly to the stomach because of gravitys pull.
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Avoid sleeping on your right side: Research has shown a higher likelihood of acid reflux from sleeping on the right side. One small study showed that sleeping on the right side is better for stomach emptying, but more research is needed on the subject.
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Avoid eating before bedtime: Eating a heavy meal before bedtime can cause digestive issues. It is recommended to eat your final meal of the day two to three hours before bedtime.
In summary, sleeping on the left side may be the best option for digestion, but it is important to use supportive pillows and a firm mattress regardless of the sleeping position. Elevating your head while sleeping on your left side can also help improve nighttime digestion. It is also recommended to avoid eating before bedtime.