To me overtime can be both a motivator or a demotivator. The reason being is that maybe people work overtime shifts for earning a few more bucks for something they want or need. Another reason I see that people work overtime for motivation is to impress their boss. However, if employees are forced or peer pressured in working overtime then yes it will demotivate people. They are doing something, they don’t want to because they don’t want to look weak or uninterested, which may decide on their permanence in their job.