Other percepts accompanied by going out of body may include blurry vision (seeing things like you are underwater); seeing or hearing other entitites nearby, and even feeling like they are steering you or guiding you; seeing a silver cord attaching your physical body to your astral body; having a sense of heightened emotion, like fear, calm, contentment, panic, or joy.

Out of body experiences can often come about through lucid dreams, sleep paralysis, or sleep deprivation. They can be spontaneous or willingly induced.

For some good literature on OBE's, check out Robert Monroe's trilogy: Journeys Out of the Body, Far Journey, and Ultimate Journey. Also, the full text of Robert Peterson's Out of Body Experiences: How to Have Them and What to Expect is available online for free at http://www.robertpeterson.org/obebook.html.