studying vs. sleeping

To have 4 exams in a row can be very stressful, it’s is however also a dilemma between studying and sleeping. I wonder what’s the best strategy? Better sleep first and then study? But what happens when you have trouble getting up?
Well well, you see, it’s very complicated. And internet makes it even worse. All these interesting things that you can find there! And of course, the most interesting is that when you have to study, you keep looking up things that you would never think of. Or how about doing a season’s cleaning? When you have to study, it’s always the best time.
People in let’s say the 19th century had it much easier as much as the internet temptation concerns. But still, where would I find the loads of information I also need to studying besides from books?