Abstract: The sleep of 400 nurses on shiftwork and daywork between ages 20 to 35 were investigated by questionaire. Then 88 subjects were given "The Clinical Memory Test" including the following 5 subtests: directed memory, paired-association learning, free recall of picture, recognition of meaning- less figures, recall of the connection between portraits and their charact- eristics. The results indicate that sleep quality during shift working in the nu- rses of shiftwork was poor. Although sleep quality during day working in the shiftwork nurses was improved, it was still not as good as the nurses of daywork. There were no marked differences in the test scores of all items in both shiftwork and daywork groups, however, differences of me- mory characteristics exists between the two groups.

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