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Once you've given your body enough time to digest your dinner, you may still have to sleep with your upper body elevated to prevent the reflux of stomach acid into your esophagus. Sleep propped up in your bed with several pillows or a specially made foam wedge.  Plastic or wooden wedges are made to fit between your mattress and box spring to elevate your upper body. These are available online or at medical supply stores. If you suffer from back pain during your pregnancy, don't forget to support your low back curve with a firm pillow. To help keep food and digestive acids in your stomach, it's best not to bend over an hour or two after meals/snacks. Bending over at the waist puts pressure on your stomach and can squeeze some acid out into your esophagus. Instead, use your knees to bend down to pick up things or ask for assistance.  You may also have to temporarily stop exercises that involve lots of bending over, such as yoga, aerobics or martial arts. Keeping flexible during pregnancy is important, but avoid trying to touch your toes if you're experiencing heartburn flare ups. Finding the right clothes during pregnancy is difficult due to an expanding belly, but it's important not to wear shirts and pants too tight because they can push your growing baby into your stomach and trigger indigestion or heartburn. Instead, wear loose-fitting and comfortable clothing, especially during the last half of your pregnancy.  Consider wearing partially synthetic fabrics which have lots of stretch to them so your abdomen experiences less pressure. Avoid belts and opt for elastic waistbands on pants and shorts. Another strategy for coping with chronic indigestion and heartburn during pregnancy is chewing gum after meals. Chewing gum stimulates the production of more saliva from glands, which can help to neutralize acid reflux in your esophagus when you swallow it. Compounds in saliva are much more alkaline than stomach acid, so it helps to neutralize it and stop the burning sensations.  Avoid peppermint or wintergreen-flavored gum because mint and menthol can trigger or aggravate heartburn symptoms. Avoid gum sweetened with aspartame because it can bloat you and promote indigestion/heartburn. The sweetener xylitol is a better, safer choice. Most women know that cigarette smoking can harm developing babies, but most probably don't know that it also boosts stomach acid production. Smoking also decreases the esophageal sphincter's ability to open and close properly. Needless to say, stop smoking immediately if you're pregnant.  The lower esophageal sphincter is the valve between the tube that carries food (esophagus) and the stomach, where most of the digestion takes place. Babies born to mothers who smoke are smaller in weight and tend to have many more health problems.

Summary:
Sleep with your head or upper body slightly elevated. Avoid bending over at the waist. Wear loose clothing and avoid anything tight around your stomach. Chew gum after meals. Don't smoke.