The only way that I have found to put the OUYA to sleep is to close XMBC, return back (twice) to general OUYA menu (yellow Y represents "System Menu"), press Y (System Menu visible), scroll down to sleep, enter. I can "wake" the OUYA by pressing my play remote button.
I can navigate until I get to the yellow Y, but have no key mapped for Y. I am no programmer, and am lost when it comes to remapping keys, rooting, ect....
Hoping for an easier, more obvious way to gain access to this key with my Harmony and Flirc.
Thanks,