I've had many out of body experiences; happens quite often actually. And the same thing happens as well, I awaken with a heart racing faster than a NASCAR driver. But to willingly and/or effortlessly travel outside of your body without the help of being asleep or in a dream-like state, not sure that's very possible. Now, i'm no expert on the OP... But something like that seems possible only if (and that's a big IF), us humans actually have a "spirit/soul." Furthermore, it would only seem possible to experience after one has deceased. And in that case, you wouldn't be able to prove it, nor receive a Nobel prize. I'm with Babylon.