When that act of studying sends you into a depressive state. Symptoms include; sudden onset of fatigue, self doubt, lack of confidence, increase or decrease in appetite, irritability and fantasies about academic failure.
Matt: OMG I will never pass this test, I 'm too stupid!
Rachael: You will, you always pass your tests, you douche.
Matt: No I won't. I can't concentrate, I get so tired as soon as I open my book! Tomorrow I'll bomb out. I might as well quit the course now!
Rachael: Don't be a tool! You've got study depression, you'll get over it.