I was told by my doctor that I'm too sleep deprived...
(It literally made me pass out twice during the past three months.)
So yeah, keep laughing mate, but I'm working my ass off here.
I wasn't questioning that you did it, only that you think jobs don't do that. I know plenty of people personally who do that for months at a time.
That aside, I wouldn't really compare studying to work. My job is far and away more mentally exhausting than anything I did in University; I enjoy my job, but it's not even on a comparable level of exertion to University.