Dreams: an unexplained phenomenon Dreams are a series of thoughts, images and sensations occurring in person's mind during sleep. As simple as this definition is, the concept of dreams can't be explained. How a person would sleep and thoughts and images would start occurring in his mind while he is totally unaware of what's going on around him is really fascinating. Dreams can be scary, beautiful, funny and confusing at the same time. Nightmares which are frightening dreams…