Here is a book that might interest you.  It is how a Jesuit gets himself into position to see visions, do wierd things, etc.  The book is from Roman Catholic sources.  It is either self hypnosis or communication with demons.  Probably, and seriously, both.  Read with discernment and have your bible nearby to be able to consult

This book is out of copyright the last i checked.  If you need to know the current situation on this go to www.archive.org.  It is where I got the book.