I'd suggest you see a doctor, and also follow the advice to raise the head of your bed with blocks to keep acid from getting into your esophagus. You have something going on, it could be GERD, or it could be issues with swallowing.
I have this symptom as well, and it was due to LPR or silent reflux. It is because the esophageal sphincter relaxes and acid leaks into your larynx and pharynx. You should see a doctor immediately to see if it might be this.
I am planning to see my GI in the end of February, so I think I will bring it up to him. My little sister had LPR, and she sleeps with these "bed wedges", a big foam triangle thing that looks like a ramp. She's got some extras, so I think I will borrow one of those.
My experience is that bed wedges didn't work at all. I worked myself down past the wedges as I slept. Trust me on this one, you will do much better by getting some scrap wood and putting equal sized boards under the head of your bed so the entire bed is raised.
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