While this is a Linux forum this came in REALLY handy so what the heck 🙂
Frustratingly hidden away, windows command for putting the machine into Hibernate and / or standby are hidden away in the api under the powrprof.dll library.
Shutdown %windir%\System32\shutdown.exe -s
Reboot %windir%\System32\shutdown.exe -r
Logoff %windir%\System32\shutdown.exe -l
Standby %windir%\System32\rundll32.exe powrprof.dll,SetSuspendState Standby
Hibernate %windir%\System32\shutdown.exe -h OR
%windir%\System32\rundll32.exe powrprof.dll,SetSuspendState Hibernate
Also if you Windows 7 wakes up and you don’t know why check:
powercfg lastwake
Hope this helps.