association between overtime and sleep quality, occupational fatigue, depression, anxiety, and stress among industrial rotational shift workers

Background: this study aimed to investigate the effects of overtime on the pittsburgh sleep quality index (psqi), occupational fatigue exhaustion recovery (ofer-15), depression, anxiety, and stress scale (dass) among food industry rotational shift workers.materials and methods: this descriptive study was conducted among 85 rotating shift workers in an iranian food industry company. samples were selected through a census with criteria considered among all 102 workers who were asked to work overtime. a demographic questionnaire, the dass, the psqi, and the ofer-15 questionnaire were used to collect information. shift workers completed the questionnaires before and after overtime. results: poor sleep quality and occupational fatigue significantly increased after overtime by 28.3% (chi-square=11.02) and 36.4% (z=-4.71), respectively. in the psqi subscales, sleep duration increased by 37.6% (z=-4.62), sleep efficiency by 9.5% (z=-2.29), sleep disturbance by 14.1% (z=-3), and the use of sleeping medications by 3.5% (z=-1.89) after the overtime period showing statistically significant increases in the categories of relatively poor and very poor sleep. furthermore, the subscales of ofer-15 showed that acute fatigue (t=-3.98), chronic fatigue (t=-7.79), and inter-shift recovery (z=-3.47) were statistically more undesirable after overtime. additionally, in the dass subscales, participants reported moderate to extremely severe stress by 23.3% (z=-4.521), anxiety by 28.2% (z=-4.47), and depression by 23.5% (z=-4.45), all showing a statistically significant increase after overtime.conclusion: overtime work leads to sleep issues, increased reliance on sleeping medications, and higher occupational fatigue among industrial workers on rotational shifts. this ultimately results in greater stress, anxiety, and depression.