Norton 2.0 save & restore doesn't work when computer in 'sleep'

Norton 2.0 has always worked before, but since I have changed power setting to allow the computer to ‘sleep’ the program doesn’t awake to run document/full backup as it did before. I can find no "wake up’  setting when computer is a sleep (as other scheduled tasks allow you to do). Sure could use some help here or I may have to go back to "never’ sleep on the HD