Display never wakes up after sleeping

Hi. I have my monitor (an HP ZR2740w) set to sleep after 20 minutes of inactivity, and it does, but if it stays asleep for an extended period of time (>1 hour), I always have to unplug it from the computer and plug it back in to get the display to go back on, as opposed to just moving the mouse. I'm using DisplayPort for the connection. Any idea why this is happening?

Thanks for the help.
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  1. I have seen this happen before on my rig and it was always the monitor plugged into the DisplayPort.

    I just set my monitors to blank instead of sleep to solve the problem.
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