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.