I'm not sure. Right now, I'm self-employed, and I don't feel dreadful when I think about work, mostly because I can set my own schedule and I don't have to play political games in order to get things done. All that matters is my performance / quality of work. On the other hand, it's obviously not as financially stable, so I need to save a relatively big cushion of money; moreoever, sometimes clients might pay you after 50, 60 days...
Anyway, I did feel somewhat dreadful when I had to work in a more scheduled fashion, especially because I'm very much a morning-day person, thus working from 9 to 5 didn't leave me much time to go out during the day, especially in wintertime. Now I actually work more hours per week (since I also work during the weekends, if I'm not travelling and-or doing something special), yet I can start at say 6:30 AM, go on until 1 PM, go out and exercise / read / whatever, then get back to working at 4 PM.