In the dream state, we can all do what some call astrotravel.
Anyone can dream about an out of body experience. It's a dream. Is there any reputable evidence that anyone has ever actually left their body?
Try your local book store. I think you will find it very interesting.
Why would I want to supplement the income of some author writing about some dubious theory. It seems that the only benefit derived from so called 'astral travelling' (although apparently some call it 'astrotravelling') is book sales. At least the Watchtower will give me fairytales for free.