System administrators need to ensure that activating system standby or hibernate features on computers does not interfere with network maintenance. Indeed, a computer can't run software patches and security updates while in sleep mode.
Instead of leaving unattended computers on at night for patching — an enormous waste of electricity — Windows Server Update Services (WSUS) can be deployed and configured to install software updates whenever client computers become "available" on the network. When services such as WSUS, Norton Anti Virus (and other client-driven update services) are running in conjunction with a sleeping, network disconnected, or "off" computer, the next time the computer is turned on or connected to the network, these services force a check-in with the update server. The client computer then downloads and installs software updates in order to "catch-up" to the current level of patching. More information on Windows Server Update Services is available on Microsoft's TechNet .