Laptop will not enter sleep mode after upgrading to Windows 11

Occasional Visitor

When selecting Start->Power->Sleep, my laptop screen goes dark for a couple of seconds like it's trying to enter sleep mode, but then comes back onto the lock screen.

 

I have my laptop set up to sleep when I close the lid, but have noticed that the fan remains active and my battery is far more drained than usual, and the screen comes on immediately after opening the lid, leading me to believe it does not enter sleep mode when the lid is closed.

 

Sleep mode was working fine prior to the Windows 11 upgrade and all updates are installed and drivers are all up to date.

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