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Windows 8 automatically configures a "Regular Maintenance" event in TaskScheduler to run at 3:00 AM every day.

If the desktop machine does not have an "ACPI Wake Alarm" device (or if it is disabled in the BIOS), Windows 8 still uses the Real Time Clock (RTC) to program wake events, assuming the power policy/Advanced settings/Sleep/Allow wake timers is Enabled for AC power. Also, the power policy/Advanced settings/Sleep/Allow wake timers will default to Enabled for AC power. Causeįor Windows 8 desktops or All-in-one computers, under Action Center > Automatic Maintenance, the Allow scheduled maintenance to wake up my computer at the scheduled time checkbox is automatically enabled. This article provides a solution to an issue where desktop wakes up unexpectedly from sleep or hibernation.Īpplies to: Windows 8 Original KB number: 2799178 SymptomsĪ Windows 8 Desktop computer is automatically waking from sleep or hibernation at a certain time even if there is no "ACPI Wake Alarm" system device found by the operating system. Desktop wakes up unexpectedly from sleep or hibernation