Welcome @amaastain.
You mention that you've had this issue of distorted sleep for at least the past 5 years and that it was detected that you were born without an oesophageal sphincter. Has this issue been increasing with the years or have you had problems since birth. Might the underlying issue be something other than the absence of an oesophageal sphincter?

Until you and medical doctors find the underlying cause, you might find these related discussions helpful.

@lori57216 started this discussion about raising your bed for sleeping.
- Adjustable bed frames: Acid reflux after esophageal cancer treatment https://connect.mayoclinic.org/discussion/adjustable-bed-frames/

And see the tips in this discussion:
- Acid Reflux - Natural Remedies? Diet Tips? https://connect.mayoclinic.org/discussion/acid-reflux-natural-cures-ginger-for-digestive-issues/

How has the acid reflux been managed for you?