Currently working 9pm-5am.
I actually really like it.
I spend all night watching videos although youtube and several other sites don't work, we have a very low grade flash plug-in to eliminate them.
I read A LOT. Wikipedia, webcomics, novels, whatever.
I'm writing a book as well.
I've put about 67 hours in Final Fantasy Tactics Advance A2. Nintendo DS is a godsend. PSP isn't bad either.
As far as sleeping goes, try to sleep right when you get home so you wake up around 3-5pm. I find that allows me the most opportunity to get what I need done taken care of during the day. There is NO ONE at the grocery store at 3 pm.
If you don't have supervisors, bring in a laptop if you have wifi. Portable DVD player, whatever. Learn magic tricks. Do everything you ever wanted to do but didn't because you had something better to do. That kind of thing
.