<p>I would second everything that SHolmies said, qualified by the regret that s/he seems to steal wisdom directly out of my mouth, and amended to add that how much you work also depends on the kinds of classes you take and how many of them. As an example, I felt my best when I was overloading with 5 classes all of sophomore year, and training three horses three times a week, and baking for the campus coffeeshop three times a week, and designing the literary magazine, and doing a few other things that I’m now completely forgetting because it was two years ago. But I was sane, and my friends often remarked on how unstressed I seemed–probably because I spent more time actually doing my work than whinging about it.</p>