It seems for me that every new OS release causes major sleep/wake issues where my machine will sleep for a few minutes, then wake, repeat ad infinitum. Reset PRAM etc may or may not work, then after several updates to the OS, the problem goes away. The only reason I notice this is due to hearing my raid box come on and go off. I guess it could just be bad luck, but am damned tired of this crap Apple. /rant