Wow. I stopped using my computer last night at around midnight or so, and left it beside my bed. I was so tired I forgot to put it to sleep. Right now I have the forest screen saver going. It's now 8:12 in the morning and the screen saver was still running with 14 minutes left on battery life. I left it with about 2 hours of life when I went to sleep. I have sleep turned off for all you doubters It turns on only when I close the lid. How cool is that?