Here are some excerpts from Out-of-Body Exploring by Preston Dennett.
“Most advanced astral travelers believe that everyone goes out-of-body every night. At first this seemed absurd to me, but as I began to remember more and more of what happened to me at night, I realized it was true. We may think we are asleep, we may not remember, but the reality is, all of us are very busy every night.”
“If you examine your dreams, you will see that most of them represent your fears and desires. By going out-of-body, you are forced to face these issues head-on.”
“Most out-of-body explorers report that they have spirit guides who assist them on their journeys. Others meet advanced spiritual beings who impart sage advice.”