This is a question that popped into my mind the other day. Normally I shut off my PB on the day I have class. I go to work at 7:15am, and don't have class until after work at 6:30pm. I could put my computer to sleep, but that brought up this question - which I think only someone who has experience can answer (but you never know...) I know that when a computer is sleeping it uses a little bit of power, and when it is off it uses even less. But, waking uses much less power than rebooting. So, at what point is it better for me to shut my computer off rather than just put it to sleep? I know that in my example, I could take my power brick, but the classroom is just not conducive to plugging in a computer.