When I wake up in the morning, I have food residue in my mouth. Is there something wrong with my digestive system?

Gastric Reflux? When we are awake, our mouth is above our stomach. However, when we lay down, a weakness in the muscle that prevents the stomach contents from leaking up the esophagus is also known as gastric reflux. This is a hiatal hernia. Please see your physician and discuss your symptoms with them. Not pursuing treatment could lead to heart burn & dental decay because of the acidic contents of the stomach.
Maybe. This could be a symptom of gastroesophageal reflux disesae (gerd). You should see your doctor to discuss this further. Also, you shouldn't eat for 3 hours before going to sleep at night.