Have you ever stopped what you're doing and thought for a second "wait, am I dreaming?" If you were, in fact, asleep at the time, you might have been having a lucid dream. It's a type of dream in ...

During deep sleep the brain remains very active(Thomas Barwick/ Getty Images) Aristotle gave them some thought and Rene Descartes lost his bearings over the very idea ...

I was sitting in my room when I asked myself, “Am I dreaming right now?” I looked around at my surroundings and immediately noticed a large elephant standing in the middle of my room, hardly fitting ...