The rapid industrialization is associated with an increase in shift systems. Sleep problem is a major complaint of shift workers. This study was undertaken as one of a series of researches on shift workers and sleep. The purpose was to understand the sleep pattern and to offer basic data in order to improve a sleep regimen. The sleep log was administered to a relatively homogenous group of 38 psychiatric nurses who were on the two-daily phase delay( day/evening/night) rotating shift schedule. Some possible influencing factors to sleep pattern (age, sex, marital status, work duration, drug use, and physical and psychiatric diseases including sleep disorders) were controlled. The sleep measures were main sleep (starting time, latency, number of awakenings, length and subjective quality), nap(number and length) and total sleep length (main sleep length plus nap length). Each measure was analyzed and compared accross the rest times at which the workers can take sleep and nap. Also, the possible relationships between the main sleep (quality and length) and naps( number and length) were analyzed. The following results are based on the data of 33 of the 38 subjects. Five of the subjects who did not sleep during the rest time after the second nignt shift were classified seperately. 1) T he beginning of the m ain sleep phase was delayed during the rest times after day, evening, and night shift while advanced during the rest times after days off. 2) The sleep m easures were significantly different across the rest times ; for latency(F(7,224) = 2.12, p < .05), quality(F(7.224) — 8.97, p<C001), length(F(7.224) — 41.13, p〈.001) of main sleep, and number of nap(F(7.224) = 19.27, P < .0 0 l) and length of nap(F(7.224)= 12.79，p〈.001). The main sleep taken in the day time after night shift was generally poorer quality and shorter length than that in the night time after day and evening shifts and days off. Nap was relatively longer and more frequent during the rest time after night shifts than during the rest time after day and evening shifts and days off. 3) There were significantly negative relationships between the total length of main sleep and total number of nap(r= — .3632，p<.001) and between the total length of main sleep and total length of napCr^ — .2253, p<.001) across the rest times. - 332
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연구대상 및 방법
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