How did it get into sleep? Are your energy settings such that the monitor is turned off earlier than the PC itself goes into hibernate? Or is it the PC that wakes up for some reason and - in turn - wakes up the monitor?
my pc monitor keeps waking up randomly by its self. I know its not the monitor just purchased it and the old monitor was doing the same thing. Im thinking it has something to do with video card. any suggestions would be greatly appreciated