Late Night Regurgitation

A few nights back Sidney woke me up at about 3am making swallowing sounds. Kind of like 'gulp' sounds. He jumped out of the bed and went, I assumed, in the bathroom to lay down. I kept hearing the sounds so I went in the bathroom and turned on the light and he wasn't there. He was still in the bedroom, but sitting in a tall (close to vertical) position with his back against the wall. Definitely an odd behavior.
Anyways - I carried him into the bathroom and let him stand horizontally on all fours and he finally regurgitated. It was a ton of RG. I stayed up with him the rest of the night and everything seemed fine after that.
His odd behavior made me wonder if he kind of has learned that being vertical when his esophagus is irritated or full makes him feel better. I know when he is on the couch he sits like a person with his head on the back of the couch when we think he's feeling bad. Maybe Sid is smarter than we think.
Sometimes we go weeks or a month without RG, but sometimes it happens a lot. That's the deal you sign on for with caring for a dog with Canine Megaesophagus. Which is cool with me.