Raise head end of bed. Take Omeprazole
empty stomach in morning and an antacid gel at bedtime. Refrain from smoking, alcohol, fuzzy drinks, caffeine, and spicy food. See if this helps. If it helps, then consult a gastroenterologist. If it does not help, then the pain can be due to wrong sleeping posture or due to sleep apnea. Get this investigated. Hope this helps. Take care!