Whether you remember it or not, you experienced several very different dreams last night. Each of them can be assigned a lot of meanings, but it is always possible to discover one thing common to all, and this meaning invariably coincides with the meaning of events occurring in reality. By examining his own dreams and facts known to somnologists, the author came to the inevitable conclusion: for our consciousness the state of sleep is more primary wakefulness. This “seditious” idea made it possible to explain many facts that baffle scientists. The world of dreams indicates the existence of a different level of existence, with which our brain communicates during periods of sleep. It is not material, not substantial, but it is quite real: the territory of sleep is a full part of reality.