Dreams are made real by the neurochemistry of the brain. Because dreams are founded on sensory information and are processed by our brain. Our basic senses, with the exception of vision, are also active while we sleep. When we dream, many of the same regions of the brain that are responsible for perceiving reality are also used to process the memories and images found in dreams. As a result, the world we experience in our dreams actually reaches through the pores of our skin and enters our bodies via our eyes, ears, and other sense organs. There are two ways in which we can know whether dreams come from reality or not: first, if we wake up during the night and find out that it was only a dream, then dreams are purely mental events that have no physical counterpart; second, if we don't wake up during the night, then they are reflections of reality. However, there are cases when people remember part of their dreams but not all of them. This means that some dreams are based on physical sensations while others are not. For example, someone may dream that he or she is walking down the street when suddenly a car hits him or her. Because these sensations are not connected to thoughts or feelings, they cannot be reflected in the mind. Instead, they must be experienced physically.