An out-of-body experience (OBE or sometimes OOBE) is an experience that typically involves a sensation of floating outside of one's body and, in some cases, perceiving one's physical body from a place outside one's body. About one in ten people think they have had an out-of-body experience at some time in their lives.
Despite some similarities in their phenomenology and induction methods, EEG studies do not suggest an equivalence between OBEs and lucid dreams. Lucidity is strongly associated with stage 1 REM sleep but OBEs are far less consistent, producing EEG traces that can variously resemble stage 3 sleep, a waking, eyes-closed state or other uncategorized states.
However, while this may suggest that perceived OBEs are a type of lucid dream which takes place in a dream environment that mimics the actual environment of the dreamer, this falls short of supporting the idea that some conscious form of the dreamer actually leaves the body and perceives their external environment while still in a sleeping state.