I know there have been a few posts about this before, but mine seems a little different. Since upgrading to Tiger back at the launch this has happened like three or four times. But after charging up my Macbook, and then pulling the plug and then opening the lid, it seems to stay in sleep mode. The snoozing light on the front continues to go in and out like when the lid is closed. It never happened when using Tiger. This isn't a huge problem, but its somewhat annoying and I have to hold the power button down to get it to reboot. I'll note I have not had the problem that some have reported of laggy behavior when coming out of sleep. Mine just stays asleep. Is this a known bug?