Troubleshooting
How to Troubleshoot Windows 11 Sleep, Wake, and Modern Standby Problems
Windows 11 waking by itself, refusing to sleep, or draining battery overnight? Use powercfg and SleepStudy to identify the real cause before changing settings.
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Troubleshooting
Fix Sleep Mode Not Working After Upgrading to Windows 8.1 (Historical)
Troubleshoot a Windows 8.1 PC that will not enter sleep by checking available sleep states, active power requests, drivers, and wake-enabled devices.