I have a mbp SR 2.2, 2G ram. Just bought several weeks ago. I do not shut it down --- just let it sleep when I am not at home. However, after upgrading to Leopard, I found out that every time I come back home, or I wake up in the morning, the computer is not sleeping at all! I am pretty sure that it falls asleep when I leave (the little led starts breathing, fans stop spinning, etc). I've already turned built-in airport off, no network cable connected, and the "wake for network administrative attempt" from the "Energy Saver" in system preferences is turned off as well. I don't see any reason it wakes itself. Is there anyone has the same problem? Does it have something to do with Time Machine? I do have it turned on. So will it wake itself for the "hourly backup"?