Painful sensations increase when a person is having a rest. Did you notice that your acid reflux symptoms are getting worse while you’re taking a nap? A lot of patients suffer from the same symptom each time they try to lie down. Try to stand a little while; such posture prevents stomach acid from slipping to the esophagus. It can be explained by the fact that gravity improves digestion and decreases various convulsive activities. Now you know that a rise in the burning sensation during the process of sitting or sleeping is the first sign of the acid reflux.