Just to be clear, Windows has two low-power modes:
Sleep - All non-essential activities and drivers are stopped and the processor goes into power-conservation mode
Hibernate - The current system state is stored to hard drive, and the system powers off
Sleep is enabled OOTB and can be controlled by control panel.
You can enable hibernate from the advanced power settings in control panel.
In Windows 10, you can set the timeout so that after sleeping for a certain duration, the PC automatically hibernates to go to deep power saving.
Windows 11 seems to be missing the UI feature to set that time out and by default it's set to a very long time (like 16 hours)
Here's how to enable hibernate and set the timeouts by the command line.
Open an elevated command prompt (run as administrator)
Enable hibernate: powercfg /HIBERNATE ON
Query the current hibernate idle settings: powercfg /Q
Look for a section that looks like:
Power Scheme GUID: 381b4222-f694-41f0-9685-ff5bb260df2e (Balanced)
GUID Alias: SCHEME_BALANCED
Subgroup GUID: 238c9fa8-0aad-41ed-83f4-97be242c8f20 (Sleep)
GUID Alias: SUB_SLEEP
Power Setting GUID: 9d7815a6-7ee4-497e-8888-515a05f02364 (Hibernate after)
GUID Alias: HIBERNATEIDLE
Minimum Possible Setting: 0x00000000
Maximum Possible Setting: 0xffffffff
Possible Settings increment: 0x00000001
Possible Settings units: Seconds
Current AC Power Setting Index: 0x00000000
Current DC Power Setting Index: 0x00000e10
0x00000e10 = 3600 seconds
To set the DC power (battery power) timeout: powercfg /x hibernate-timeout-dc 60
This will set it to 60 min or 3600 seconds or 0x00000e10 seconds
You can even make it work when on AC power (plugged in): powercfg /x hibernate-timeout-ac 60
