When I go to bed, I like to just put my macbook pro to sleep by closing the lid. But almost 100% of the time it wakes itself. It gets really hot when this happens so I've been turning it off most of the time instead, but I'd really like to get this resolved. I have an external monitor plugged into it so I know its awake as the screen shifts over to the external monitor. When no monitor is plugged into it, I do occasionally hear the hard drive spin up. I have tried unplugging everything except for the power cable to see if that might help, but the result is the same. Any ideas? I have a 1st generation 15" Macbook Pro running OS X 10.5.3.