If your PC won't stay asleep it's often because a device is configured
to bring it out of standby when triggered. Identify the culprit by
pressing the Windows key and [R], type "cmd" and press [Enter].
Type the following line and press [Enter]: powercfg –devicequery wake_armed
Now
press the Windows key and [R] again, but this time type "devmgmt.msc"
to open Device Manager. Find any devices listed earlier, then
double-click them and look for an Advanced or Power Management tab.
Check
if the device is allowed to bring the PC out of standby – if it is,
untick all the boxes that wake it. Click OK, close Device Manager and
test it worked
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