Dream

**Dreams** are what a person sees and hears in their mind when they are sleeping. They are often similar to real life in some ways but can also be very strange. Dreams can feel so real that the person dreaming may not believe they are awake. This tends to happen during a false awakening, where a person dreams of waking up. A person has around 4 - 6 dreams per night and tends to only remember the last two. 

Sometimes, a person realizes during a dream that they are dreaming but keeps having the dream. This is called a lucid dream. This rarely happens for most people. During a lucid dream, a person usually has full control over their body as well as the environment around them. There are no limits in lucid dreams, sometimes not even the imagination.

Most people remember their dreams in some way or another, even if it is only a small part, but children are more likely to remember most of their dream clearly. It is 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. This is called dream recall. The more it is done, the better they remember their dreams. If a person is woken up during a dream, they tend to have a much more reliable memory of it.

Nightmares are dreams which scare or shock people. Nightmares are usually based around a 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 civilizations thought dreams were messages from the gods (see the works of Homer) or 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.

## Freudian theory 
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  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.

Some authors, such as Hans Eysenck, have argued that the dreams Freud cites do not really support his theories. Eysenck argues that Freud's examples actually disprove his dream theory.

## Modern work 
Since Freud, the emphasis has been on the biology of dreaming.

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. In particular, dreams occur mostly when the brain is in the REM state. There is also some relationship between dreaming and daydreams. Both seem to occur in a cycle of 90110 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 behavior."

## References