The computer turns itself on automatically when it is in sleep, standby, or hibernation.

The computer might wake itself up if you have timed events scheduled with the wake timers enabled. Examples of a timed event are antivirus/antispyware scan, disk defragmenter, automatic updates.

NOTE: By default, the Windows Automatic Updates are scheduled to install new updates Every day at 3:00 AM.

Follow these steps to disable the wake timers.

1. Click the Start button, and then click Control Panel.
2. In the Control Panel window, click System and Security.
3. In the System and Security window, click Power Options.
4. In the Power Options window, choose the power plan you want to change and click Change plan settings.
5. In the Change settings for the plan: window, click Change advanced power settings.
6. In the Advanced settings window, click the + plus sign in front of Sleep and then click the + plus sign in front of Allow wake timers.
7. Next to Plugged in:, click to select Disabled and then do the same for On battery:.

NOTE: The computer also could wake up automatically because of a Network device. Follow this procedure to Disable a Network device from waking the computer .