Windows Sleep command

http://answers.microsoft.com/en-us/windows/forum/windows_vista-desktop/desktop-shortcut-for-the-sleep-command/4e57f536-50a8-4942-a84a-290b3dea1ffb
http://support.microsoft.com/kb/555569

Rundll32.exe Powrprof.dll,SetSuspendState Sleep

powercfg -a
The following sleep states are available on this system: Standby ( S3 ) Hibernat
e Hybrid Sleep
The following sleep states are not available on this system:
Standby (S1)
The system firmware does not support this standby state.
Standby (S2)
The system firmware does not support this standby state.