Why do you get nightmares after eating then going to bed?

Any physical discomfort, such as indigestion, acid reflux, or abdominal gas, can be sensed by your sleeping mind and expressed in uncomfortable dreams. The same physical discomfort can cause you to sleep fitfully or awaken several times during the night. It is this discomfort that triggers nightmares combined with repeated waking that causes you to remember dreams that would ordinarily be forgotten if you had slept soundly through the night.