Sleep is a physiological state, the second zone of life where consciousness fades. Not all aspects of sleep are fully explained, there are many mysterious, latent and fascinating elements completely unknown and undiscovered. For centuries, people have attempted to interpret dreams and explain their relationship to everyday life. Over the years, observations and records have allowed dreams to be assigned a particular meaning. Usually a dream is interpreted as an announcement of what is about to happen in life. However, sleep should not be treated as a prophecy in every case, because in many cases it is also a warning, a clue, a call to change the way we behave and a disclosure of our personal qualities.