Agree with all of the above. People are just attached to their worldview and are unwilling to accept any challenges to it. It's a survival mechanism and it's not an entirely bad thing. But in this case, the doubters are just showing their close-mindedness. I think the best way to approach the topic is to describe it as:

"You know, like when you're a little kid, and you're having a nightmare, and you realize you're having a nightmare, so you wake yourself up."

I think most people can at least accept and relate to this, even if they haven't experienced it first hand. It's common enough that it should slip past their reflex to reject everything new. Anything beyond that and they might start to resist, but they're less likely to think you're completely nuts.