I essentially did this throughout my college career. I don't think it was 5pm, though, more often 7pm. What set me off was getting so frustrated one night doing Calculus at 10pm. I tend to need 8+ hours of sleep per night, so by 10 I wasn't in the best mood for studying.
It got easier once I moved out of the dorms. I'd have most (if not all) of my work done by supper and finish up a little bit after. I studied Saturdays but not Sundays. That left my nights open for things like irc or setting Red Hat up on my machine.
I found I was a lot less stressed than my friends that played N64 all day and STARTED studying at 8pm.