Occupational medicine (Philadelphia, Pa.)
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Work hours affect sleep because the sleep behavior of people on nonworkdays differs from that on workdays. For most workers, workday sleep is shorter than nonworkday sleep. On nonworkdays most workers sleep at night. ⋯ Subjective measurements can be used for these assessments if care is taken to use appropriate methods. It is recommended that this data be collected by asking workers quite literal and concrete questions about the time of day they usually elect to go to sleep and get up. A sleep survey of this sort should gather main sleep period and napping times for both workdays and nonworkdays, so that the infradian sleep strategy of the worker can be identified.(ABSTRACT TRUNCATED AT 400 WORDS)