By the way, i found another one very fresh study that is usefull for this topic:
Recurrence of gastroesophageal reflux disease correlated with a short dinner-to-bedtime interval.
Conclusion of the study:
Both ERD and NERD patients who sleep within 3 h after eating have a higher risk of GERD recurrence. Our findings highlight the impact of a short dinner-to-bedtime interval on the recurrence of GERD (ClinicalTrials.gov ID: KCT0000134).
Here we are: it is needed 3 hours before bedtime.