I have done a job that was 80% dull work. I can guarantee you I have never been more exhausted when I came home from work. Don't ask me how it works, but doing

I have done a job that was 80% dull work. I can guarantee you I have never been more exhausted when I came home from work. Don't ask me how it works, but doing 'nothing' can be extremely tiring. And this was a desk job.