are you studying at home?

because if so, before you start you could listen to some relaxation music- just to put your mind at ease.. i know i used to do that, and still do it- if i have a situation that needs me to be calm

btw, i have a theory why people study better when depressed (this is just me though) and my ideas

it's because when you're in an "elevated" mood, as you call it, you want to make the most of it.. you don't want to be stuck studying, you want to do things- and make the most of the good mood

and when you're depressed, it's just.... i don't know. you realise that you don't really want too, but it's the only thing to keep you from the thoughts