They're no problem with modafinil my friends . .. just convince your doctor that you have narcolepsy or "shift work sleep disorder" and you'll be on your way to super-human wakefulness periods in no time!
Yes this site looks skecthy, but summarizes things pretty nicely.
http://www.modafinil.com/
***Note: I'm not actually suggesting perscription drug abuse, trying to be humerous***
But in all seriousness I'm surprised that I hear about aderall abuse, but have not heard of students trying to get their hands on this. I by no means advocate it, but if one was inclined to use drugs to stay awake, I think this one would probably top the list.