I have set my display to sleep even when plugged in and when it is idle for only one minute. The screensaver is set for 5 minutes (after the display sleeps!), but the screensaver always comes on. I can leave my MBP on all night and the screensaver will run all night. This issue is sometimes fixed by a reboot, but then it comes back shortly thereafter. E.g. when I went to bed last night, the screen would sleep. When I left this morning, the screen did not sleep. I only used the computer for ten minutes in between. What could be causing this? To clarify: I'm not talking about the computer sleeping. I'm talking about display sleep. I do know that I can setup hot corners, but I don't want to.