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Windows Vista and later versions of Windows go back to sleep or hibernate automatically after a specified period of
time if you do not touch the mouse or keyboard. The default time is set to 120 seconds.
To change that value, open the REGEDIT tool, then select the following key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\238C9FA8-0AAD-41ED-83F4-97BE242C8F20\7bc4a2f9-d8fc-4469-b07b-33eb785aaca0\DefaultPowerSchemeValues
The DefaultPowerSchemeValues key contains three subkeys, which correspond
to Balanced, High Performance, and Power Saver options. You need to change the
ACSettingIndex and DCSettingIndex values in all three keys. You can either
set a period longer than the maximum anticipated duration of the run of the scheduled
task (in seconds) or set 0 to turn off this feature.
References
Power Policy Configuration and Deployment in Windows
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