There is a new book just published that will be of interest to many of the readers on this site. It's entitled "Drugs of the Dreaming, Oneirogens: Salvia Divinorum and other Dream enhancing Herbs" by Toro and Thomas.
I just received my copy. It appears they did a very comprehensive job capturing summaries of just about any substance ever associated with the dream process. I would have liked to see some more experiential reports. It seems a little weak there. I'm still waiting for someone to publish a book that captures a set of herbs like this along with well documented controlled experiments to prove or disprove their value.
As I read through it I'll assess its value and write a more comprehensive review if warrented.