They analysed several categories of health problems and the risk for all of them were higher for people who worked overtime. Though, ppthe categories that were most impacted were sleep, fatigue and mental health. People that worked overtime were 90% more likely to be sleep deprived, 44% more likely to be fatigued, 49% more likely to be depressed, 51% more likely to be stressed, and etc. Almost every study to date has shown that working overtime is bad for you. Try to avoid doing it long term since you'll end up with a lot of health problems.