Fix Logitech di Novo Keyboard won't let computer sleep

The beautiful Logitech di Novo Bluetooth Keyboard/Trackpad, when it's plugged into its charging stand, won't let my Windows 7 stay asleep - when it was on the charging stand, the computer would always wake up immediately.

A solution seems to be to disable the ability of the Keyboard and Trackpad to wake the computer from sleep - although this means that the keyboard's sleep button won't unsleep it:

• Start, type 'Device Manager' and open it.
• Find Keyboard / Logitech HID Compliant Keyboard and Mice... / Logitech HID-compliant Touch Pad Mouse 
• Open each and go to the Power Management tab
• Uncheck 'Allow this device to wake the computer from sleep'

PS: Did the keyboard one just go back to its original setting (enabled) by itself, or did I set it myself...?