The doctor-recommended solution for acid reflux is to sleep on a gradual incline to prevent acid from traveling up your esophagus. I have acid reflux and I use a dense foam, six-inch-high wedge that lives under my actual mattress.
I used to be miserable when I slept on a hotel room’s flat bed. I tried to stack pillows but it was never comfortable. I also tried short wedges. One was an inflatable wedge about the size of a pillow (totally did not work). The other was foam and went from my head to my waist (not comfortable either).
My wife found this full-length inflatable bed wedge. I bought three and placed them under a king size mattress on week-long vacation. It was the most comfortable I have slept on vacation in years.
On overnight travels by myself, I just take one and place it on top of a flat bed. It’s not perfect, but much better than sleeping on a flat bed.
After searching for and finally finding something that worked I thought it was definitely a cool tool!