I had terrible acid reflux at night when I was in my 20s. It was awful. I was getting a couple of hours of sleep per night, then waking up in terrible pain, stuffing down plain yogurt under a doctor's orders, and sitting up on a sofa for the rest of the night.

Putting my futon on a sheet of plywood with two concrete blocks under the head completely solved the problem within a few days. It takes a while to adapt to sleeping on an incline. I kept it up for about a year, then went back to a flat bed. I've never had acid reflux again.