Dreams and REM sleep
The most vivid dreams occur during REM sleep. These dreams are often elaborate and emotional experiences that include sadness, anger, apprehension or fear. A person can more readily recall a dream when they awake from REM sleep. However, the purpose of dream content is not currently understood.
Sigmund Freud suggested dreams were a representation of unconscious thought. Another hypothesis proposes that dreams are a random brain activity during REM sleep and not a meaningful experience.
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