OK, I’ve not “finished” this book. I’ve scanned through bits; it’s a reference work. But it’s such a unique and valuable reference work it deserves recommending here. This is just the book on “oneirogens”, dream-enhancing drugs, you’d wish for: authoritative, open-minded, concise and accessible. I can’t vouch for any particular substance, having had mixed results myself. But here’s your guidebook if you want to start your own research programme.