I read some stuff about that in the Journal of Near-Death Experiences-there has been quite a few reports of people leaving their bodies and being able to move around freely, and being able to see through walls-im not shitting you. One of these people was in an X ray room with thick lead walls to make it even weirder. The most obvious explanation is that these persons 'self' has entered a dimension parallel to our own. Very, very weird.

Also, Einstein's theory of relativity depended on the speed of light being a fixed constant-there is now serious doubt that it is, so that might change how we percieve things a bit.