Galaxy Nexus - Sleep While Docked?

Just got the Samsung Pogo Dock for the Galaxy Nexus, and as soon as I dock the Nexus, it opens the Clock app and never sleeps. I can go to the Home screen, and the phone will sleep just fine, but if I dock the phone and walk away, the screen does not go off. Is there any way that I can either stop the Clock app from starting on dock, or set the Clock app to allow the phone to sleep?