How do you get in your "productive" mode?
nostrademons: Are you trying to work for 1h on top of the 10h you've already worked in school?  If so, that may be your problem.Almost nobody can work for 10h straight.  I'd guess that you're taking breaks for lunch and between classes, and to hang out with friends.  It could just be that you've run out of juice by the time you get home.I've found that I get about 3-4h of good, productive, cognitively demanding work done a day.  My friends in grad school say this is fairly typical of them too.  If there's an exciting project with a deadline, I might be able to go up to 7-8 hours in bursts, but that's paid for by a week or so of complete unproductivity afterwards.The good news is that this is enough.  Those people you hear about who've built world-changing inventions?  They didn't do it through working more, they did it through working more effectively.  That means paying attention to what's important, doing it, and letting the busywork slide.