I meditate regularly. I also do guided visualizations and attempt out of body experiences. Much of this work is done in a prone position, often in bed and often before sleep. An occasional hindrance to success in this area is acid reflux. I have heard other meditators complain of this condition. I do not like to ingest medications and I have discovered a remedy which works wonders in this area and is very healthy. Simply eat a Mackintosh apple before retiring. Other types of apples may work, but Mackintosh apples work best for me.