What is the command to use to put your computer to sleep (not hibernate)?

Hope you find these useful.

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\rundll32.exe powrprof.dll,SetSuspendState Hibernate

Caution: rundll32.exe should not be used to launch powerprof.dll. Instead you should call SetSuspendState directly. This can be done using Powershell - create a file eg sleep.ps1, with the below contents.

Add-Type -Assembly System.Windows.Forms
[System.Windows.Forms.Application]::SetSuspendState("Suspend", $false, $true)

Then run it using powershell -File C:\your-path\sleep.ps1. You may first need to run the command Set-ExecutionPolicy RemoteSigned to enable powershell scripts to run.

The above script causes a system suspend, which will either sleep or hibernate depending on your current hibernate setting. To change that setting from the command line, run powercfg -h off (or on) from the command line as administrator.

See the free utility of Wizmo, which can do very many things.
The command you're looking for is probably:

wizmo standby

I found a solution. I installed a freeware program called AutoHotKey and recorded the steps to invoke Start Menu -> Sleep into a script file. Then I complied the script file into a stand-alone executable SleepWin7.exe.

Now I simply run SleepWin7.exe to put my computer into hybrid sleep.

You may uninstall AutoHotKey if this is all you need it for.

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Update: The above solution doesn't work when the user isn't logged in, i.e. Windows 7 Login Screen. (My computer wakes up at 4am every Sunday to perform weekly backup, which is done without user login.) In such case, the Wizmo program still works:

wizmo.exe quiet standby!