I don't ever work overtime but I do find that on some level that the work I am doing is engrossing enough to take my mind off rumination/reflection etc. like nothing else does. Because my work has a purpose or meaning within the context of the company (I do the advertising so I'm playing a large role in keeping the wheels turning) I become content with working away at my tasks in ways being at home cannot match (at home no task seems to be orientated towards "improving" my life) to the point where I would actually experience enthusiasm for certain projects and would be actually willing to work overtime or late to finish it. If my work load was bigger then I could potentially see myself becoming a workaholic. But the task is important, some of the other roles are abhorrent.