I always try to sleep on my left side. Right side gives me heartburn.
Same here. If you look at chart of anatomy it is obvious why. I can sleep on right side after about 2:30 AM, though.
There is a poem in my vernacular language which advises sleeping on left side. Makes sense because the esophagus, through which food you eat, enters the stomach from the right side of your body. Sleeping on left side would help reduce acid re-flux. But some exceptional people could have opposite plumbing. So try both and see which works best.
Run don't read.