Our brain when we're asleep, calculates what to remember and forget, which results in sharper and clearer thinking.
It consolidates all of our memories, so that we can ensure that important information to be remembered will be retrieved later on.
"The sleeping brain isn't stupid—it doesn't just consolidate everything you put into it, but calculates what to remember and what to forget," said study leaderJessica Payne, a cognitive neuroscientist at the University of Notre Dame in Indiana.
Research has shown that people usually remember things that has left the most emotional impact on them. For example, if people were to witness a car accident or banana leaves in the background, they are most likely to remember the car accident.
Rather than preserving scenes in their entirety, the brain apparently restructures scenes to remember only their most emotional and perhaps most important elements while allowing less emotional details to deteriorate.
reference: http://news.nationalgeographic.com/news/2010/12/101201-sleep-memories-health-brain-science/
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