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Dreams are the things that happen in a person's mind while they are sleeping. They are often similar to real life in some ways, but can also be very strange. Dreams can seem so real while they happen that the person might think that they are awake when actually they are asleep.
Sometimes a person realizes during a dream that they are dreaming, but keeps having the dream. This is called a lucid dream. This happens very little for most people, but for some people it happens often. During lucid dreaming the person will feel like they are controlling the dream, and will usually dream that they are doing fun things that they can't do in the real world.
Most people remember their dreams in some way or another, even if it's only a small part, but children are very likely to remember most of their dream clearly. It's often easier for people to remember dreams if they write down what happened in the dream just after they wake up. Because of this, many people have dream diaries where they describe each dream they have.
Nightmares are dreams which scare or shock people. Nightmares are usually based around that person's everyday fears, like spiders or dark places, but even a dream that's not about those things can feel unpleasant. Nightmares are caused by many different things: being uncomfortable or in pain while sleeping, sickness, stress, or even eating right before sleeping.
There are many different theories about why people dream and what their dreams mean. Every person has different dreams. Some psychologists believe that dreams reflect what is happening in the unconscious mind (the part of the mind that works by itself). Others think that people, places, and objects in dreams are symbols for other things in the dreamer's real life. Throughout history people have tried to make sense of dreams to learn things from them, and have often used them for divination or fortune-telling. Today there are still many books and websites devoted to making sense of dreams.
Ancient ideas on dreams
Generally speaking, ancient civilisations thought dreams were messages from the gods (see the works of Homer) or alternatively some kind of prophecy. However, they knew that often dreams misled the dreamer, and invented various explanations for this. Aristotle started off with ideas like this, but later became more skeptical, and denied the divine origin of dreams.
In his Interpretation of Dreams, Sigmund Freud connected them to his ideas on psychotherapy. Dreams, in Freud's view, are forms of "wish fulfillment". They are attempts by the unconscious to resolve a conflict of some sort. Because the information in the unconscious is in an unruly and often disturbing form, a "censor" in the preconscious will not allow it to pass unaltered into the conscious. Freud describes three main types of dreams: 1. Direct prophecies received in the dream; 2. The foretelling of a future event; 3. The symbolic dream, which requires interpretation.
The discovery of REM (rapid eye movement) and non-REM sleep has been important. Researchers have done many studies on this. Subjects have been woken up in both stages and asked what they were thinking about. It is clear that the reports from non-REM stages were different from REM stages. There is also some relationship between dreaming and daydreams. Both seem to occur in a cycle of 9-– 100 minutes.
Apparently, "there is no evidence that a more useful understanding of personality can be gained from them than can be divined from the realities of waking behaviour".
- Harris, William V. 2009. Dreams and experience in classical antiquity. Cambridge, Mass. & London: Harvard University Press.
- Aristotle, On Dreams, and On divination in sleep. In Ross W.D. 1931. The works of Aristotle translated into English. 3rd ed, Oxford University Press.
- Freud, Sigmend. 1913. The interpretation of dreams. Authorised translation of third edition with introduction by A.A. Brill. London: George Allen. 
- Eysenk, Hans 1985. Decline and fall of the Freudian empire. London:Viking. ISBN 0-14-022562-5
- Foulks D. 1966. The psychology of sleep. New York: Scribner
- Kramer M (ed) 1969. Dream psychology and the new biology of dreaming. Springflied, Illinois: Charles C. Thomas.
- Hartman, Ernest. 1997. Biology of dreaming. Springflied, Illinois: Charles C. Thomas
- Officially "sought details of their mental life just prior to waking".
- Dreaming (by Ian Oswald) in Gregory, Richard L. 1987. The Oxford companion to the mind. Oxford University Press. ISBN 0-19-866124-X