A black lady I knew was working both a nine to five job and the night shift here in order to make extra money.  I’m not sure how she functioned this way, but she seemed to manage.

Until she didn’t.  She finally got so sick from lack of sleep that her daughter had to call an ambulance.  She ended up losing all the extra money she made by working two jobs instead of one.

http://www.nakedcapitalism.com/2017/03/working-for-amazon-better-than-sex-worse-than-hell-part-2.html

Why was she working two jobs?  See earlier posts about the USA.

WARNING NOTE:  Strictly speaking, we are talking about “non-elite” jobs.  I believe that most of my students imagine they will have elite jobs, and to that I say (sincerely):  Good Luck!