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A permanent night work system in the electronics industry.

A time-budget study was performed on twenty-five electronics workers working in a permanent night work system in order to examine day-today variations in the time spent for night and day sleep and for daily activities. The work system consisted of three consecutive 12 hr night shifts without any nap followed by four consecutive days-off. On these straight off-duty days, the workers tended to have a longer night sleep as the first night shift approached, the longest on the last day. Their bed time and rising time also shifted to later times as the first night shift neared. Time for leisure activities of the workers was also shortened in the daytime between two night shifts. It was similarly short on both the first night shift day and the first day-off, due to day sleeps taken by them. Time spent for outdoors leisure activities was found to be longer on the second and third days-off, but decreased on the last off-duty day. These results suggest that the time budget of these workers is prominently affected by their intent to cope with the sleep deficit in the night shift period. Knowing their adjustment limit, they prepare for the forthcoming night work period by sleeping longer and limiting freetime. In conclusion, the compressed workweek system is disadvantageous hampering the workers' daily activity needs.