Nicely said, I think this is a mostly accurate assessment. A lot of grad students are type A, a lot are type B, and plenty are both. Still, I do think a fourth

Nicely said, I think this is a mostly accurate assessment. A lot of grad students are type A, a lot are type B, and plenty are both. Still, I do think a fourth kind exists (or a sub type of B) which is people who struggle to balance all the things in their lives and despite their best efforts end up with work on the weekends. Not everyone "choose[s] to follow spontaneous whims or to relax or procrastinate instead.", many people do their best to not procrastinate or to plan things out well, but particularly when there are deadlines it's simply hard to do. I can also tell you from experience, although this is not regularly the case, when it comes time to try to submit a paper to a conference it's definitely possible that there is so much work that there is no way to contain the work to M-F. Which is of course how people get burned out, depressed, etc. And it's all too common in academia, with grads students having to balance teaching, research, classes, and more.