I assume when students haven't been turning in work that there may be some depression going on. I also saw at Duke during my graduate work lots of students who struggled with depression.
Andy Rowell @AndyRowell "A 2015 study at the University of California Berkeley found that 47% of graduate students suffer from depression." http://qz.com/547641/theres-an-awful-cost-to-getting-a-phd-that-no-one-talks-about/ …