Abstract: The sleep qualities of 268 college students were investigated by using questionaire. Then, 20 good sleepers and 20 poor sleepers were given the tests of psychological function as the following 4 items: digit span, digit symbol, cube figure and digit cancellation. The tests showed that the short-term memory of digit span of the good sleepers was markedly better than the poor sleepers. The results indicate that it is possible that sleep quality is closely related to short-term memory in human beings. The relationship between, sleep behavior and psychological function will be further studied.

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