This is what helped for me;
Go into device manager, and properties of nic card - mouse - keyboard - etc., check properties for "Power Management" Uncheck allow this device to wake..
Nic card will typically have advanced settings as well such as wake on packet, etc. Try disabling those options as well as unchecking wake options for power management.
Redundant but check your bios wake on lan settings.
If that produces no-joy try this as a shortcut;
Shutdown.exe -s -t 00