Ever since I was a baby, I've had lucid dreams which means you know that you are dreaming WHILE you're dreaming. I know I'm in bed, my cat Gatsby is asleep on my foot, but yet I'm in this other place that feels as real and tangible as this one. But in that world, the physics are different. You can fly, walk through walls, move things with your mind, get killed, but you don't die. BTW, the movie "Inception" had it ALL wrong. Hated that movie. Anyway, one starts to wonder how real THIS world is, if that one feels just as real. Could I be traveling to other dimensions in my sleep???