Another reason working too much can be a problem is that when you work too hard this is usually at the expense of other important activities like spending time with your family and friends, relaxing, doing sport or other hobbies. While they can sometimes seem like an optional luxury, in fact they are crucial to your health and happiness and should not be neglected. And while doing those vital things your mind assimilates the information you have learned and your body recharges its energy stores. When those activities get dropped the tendency is to feel more tired, bored, and irritable which is not conducive to working productively. Also the more you work, the more your life is centred round work which can make it seem all important and very stressful.