5. Lie on your left side to help prevent bedtime heartburn after you eat a big meal.
Well, step one is to wait three to four hours after eating before you go to bed. Then yes, lying on your left side does help.
Several studies have found that sleeping on the right side aggravates heartburn; sleeping on the left tends to calm it.
The reason is not entirely clear. One hypothesis holds that right-side sleeping relaxes the lower esophageal sphincter, between the stomach and the esophagus. Another holds that left-side sleeping keeps the junction between stomach and esophagus above the level of gastric acid.