My late 2008 mbp sleeps just fine when the lid is shut, and wakes up just fine when opened back up. i know there have been issues with that sleep, but my sleep issue is a little different. mine doesnt sleep properly when the lid is left open; i have the display set to sleep at 20 minutes (screen saver set to never come on), and the computer to sleep at 30 minutes. i left the computer on and left for about an hour and a half, and when i came back the display was sleeping properly but the computer was not. the sleep light was on but steady on, not pulsing like it does when the lid is closed, but the computer was definitely not asleep, just the display. anyone else having this issue?