Acid reflux. Why the fuck can't I eat dinner right before I go to sleep without waking up the next morning, feeling like I got fucked in the throat by an acid snake? Try sleeping with your head propped up. Your lower esophageal sphincter relaxes when you lay down, and if the food you've eaten hasn't moved on to your small intestine, then the acid can creep back out. By propping your head, you will have better luck keeping the acid down. That, and don't eat right before bed anyway.