Hello all, I'm using a 20 inch iMac (iSight) and at night, I leave it to encode my DVD's. I was wondering, is there someway to put the screen only to sleep and not the full machine? It is possible via the Energy Saving preferences but I don't want the screen to sleep all the time, just at night when I want it to. Is there a keyboard shortcut or something similar that could to this? Thanks if you can help.