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Last weekend I had an interview with Fenn, an American professor of psychology, concerning the issue of the relation between sleep and memory. A new study suggests that sleep helps reduce errors in memory and this finding have practical effects on everyone. According to Fenn, the causes are not known. He suspects it may be due to sleep strengthening a vital element of the memory process—the source of the memory. Or perhaps people who don’t sleep well receive too much information over the course of the day, affecting their memory ability.