Various adverse health effects associated with extremely low frequency electromagnetic field work have been documented in occupational medicine. This study was carried out to investigate the effect of ELF-EMF pollution upon work-environment of electronic equipment repairers. It was evaluated oxidative stress and melatonin hormone levels. In order to study the prevalence of sleep insufficiency and inflammatory markers among electronic equipment repairers exposed to EMF. The electronic equipment repairers are at the highest risk of oxidative stress and an increase in inïŹammatory markers following sleep insufficiency, which could be explained by lower plasma melatonin levels and higher MDA levels, but not signiïŹcant changes in monocyte count. Health education about the hazards of ELF-EMF, shortening of exposure time per day, and melatonin supplements could ameliorate the oxidative effect of EMF on exposed workers.