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Doctors explain that sleeping on the left side may help keep stomach acid lower than the esophagus due to the natural position of the stomach. In contrast, sleeping on the right side may allow acid to move upward more easily in some people, especially those who already suffer from acid reflux or gastroesophageal reflux disease, also known as GERD.
This does not mean sleeping on the right side is dangerous for everyone. However, people who regularly experience nighttime heartburn, sour taste in the mouth, coughing during sleep, or chest discomfort may benefit from adjusting their sleeping posture. Some studies suggest that left-side sleeping may reduce reflux episodes and improve digestive comfort overnight.
Sleep position can also affect breathing and circulation. Certain sleeping positions may worsen snoring or obstructive sleep apnea symptoms in some individuals. Side sleeping in general is often considered healthier than sleeping flat on the back because it may help keep airways more open during sleep.
