I don't know about you, but studying can be a huge pain in the bum for me, so I procrastinate a lot.... but that doesn't stop me from excelling in school~! Why? :'D Because when the time comes, I have my methods of cramming. I know cramming is a really bad idea since you're not truly learning the material, but dire times call for dire measures no? ;) So I don't sleep as much as I would like to.... truthfully, there are just those weeks when even though you're not procrastinating, there just isn't enough time in the day to get everything done and get a decent amount of sleep.
I saw this picture online, and although I wouldn't say that its completely true... I will say that life requires preparation and planning.... if you don't schedule your time well this is what will come of it:
