Influence of sleep duration on Gastro-oesophageal reflux

I suffer from Gastro-oesophageal reflux disease due to the malfunctioning of the Cardia in the upper part of the stomach. Even with medication I was having refluxes on a daily basis and pain in both esophagus and stomach. It was only after one year that I found out that the quality/duration of sleep had high influence on Gastro-oesophageal reflux. I experimented several sleep durations and after a while I noticed a significant increase in my quality of life when I sleep about seven hours.