Are Out-of-Body Experiences Always Spiritual?

This article brings up the question of whether 'out-of-body experiences' are spiritual happenings, or whether they are just a result of malfunctions in the brain. 

People who have out-of-body experiences report things like going through a tunnel, being enveloped by "the light", and floating above their bodies. The article discussed 3 case studies about 3 different people who have had some sort of out-of-body experience. "Patrick" reported floating above and being able to see his body in the emergency room after suffering a heart attack while driving an ambulance. "Karen" reported drifting around her bedroom while trying to fall asleep after a stressful day. "Matt" reported chronic sleep paralysis, out-of-body experiences, and hallucinations. 

All three of these cases involve out-of-body experiences, but they involve different experiences. Out-of-body experiences are most common during REM sleep, when the temporoparietal region of our brain that helps bind our sense of consciousness, is turned off.


My Question To You: Do you think out-of-body experiences are spiritual signs of the soul leaving the body, or do you think they are just a result of electrical impulses in the brain during REM sleep? Or do you think it is a mix of both?