Acid reflux is your body's response to stomach acids going back up into your esophagus, causing heartburn. Many people believe that heartburn is caused by eating too much and it can often be associated with being overweight or not exercising. However, if you suffer from acid reflux, drinking water can actually make it worse. When you're drinking water, you're actually causing your stomach to relax, which opens up your esophagus. This means that any stomach acid that is currently in the esophagus can now make its way back up into your throat. This is what causes heartburn and the symptoms associated with it. Now that you know that drinking water can actually make acid reflux worse, you may want to drink a big glass of water before going to bed. This way, you'll be eliminating any stomach acid that is going to make its way back up into your throat. You can also try to avoid eating a big meal before bed.