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Dreams seem to be a way for the subconscious mind to sort out and process all the input and problems that are encountered in waking life. Therefore, a scientist could be working on a problem ... say the structure of the DNA molecule. Then said scientist could have a dream in which he sees two snakes entertwining in a double helix. When he wakes, he has discovered the structure of the DNA molecule (true story).
Students who study and get some good REM sleep retain the information better and for longer periods of time than students who study longer, but have no sleep. This is because the brain needs time to process the information, form sensible pattern out of it, and place it in long term memory.
Dreams can also improve your emotional well-being, reduce stress, improve your creativity, and provide a playground for your mind while your body recovers and repairs itself.
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