There are MANY book of dreams, as some people are really into dream-reading. I have read some, some of them are quite interesting, some misleading and probably just fun. Some would tell about the spiritual world and the one "beyond".. Astral traveling much?! :)
But one thing is for sure - dreams can heal, as they actually tell you what's wrong with you. Dreams ARE personal, they are the interpretation of how you acknowledge the world around you and your feelings in relation to it.