Yeah Yeah a few professors kept urging us not to spend all night studying (cramping) and told us how important it is to get enough sleep before an exam.
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New memories are formed within the brain when a person engages with information to be learned (for example, memorizing a list of words or mastering a piano concerto). However, these memories are initially quite vulnerable; in order to "stick" they must be solidified and improved. This process of "memory consolidation" occurs when connections between brain cells as well as between different brain regions are strengthened, and for many years was believed to develop merely as a passage of time. More recently, however, it has been demonstrated that time spent asleep also plays a key role in preserving memory.
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http://www.sciencedaily.com/releases...0629070337.htm