My son was diagnosed with acid reflux this past April (he was 15 then).
I looked up diet and put him on a very restrictive diet for about a month of only foods that had low incidence of reflux. Basically, boneless, skinless chicken breast, broccoli, brown rice, pineapple, oatmeal. No red food at all. No dairy. Low to no fats. No brown beverages (soda, tea, etc.)
I used this site
http://heartburn.about.com/cs/dietfood/a/heartburnfoods1.htm
With a month of restricted diet and nightly Rx Prevacid, his symptoms went away. I slowly introduced foods back into his diet, trail and error, eliminating the ones that made him flair up. What we have found is with a diet that avoids the high incidence foods, and regular medication taken at bedtime, he can keep the reflux under control.
He also added a pillow to his bed to keep himself a little more upright at night time. Another option is to elevate the head of the bed to help the acid not roll back up in the night.
But, honestly, I think changing my son's diet was key for him.