After the last System Sleep, there are the following messages:
04/06/2011 21:47:10airportd[359]process_dlil_event: Set power failed err = -3903 (Operation not supported)
04/06/2011 21:47:10kernelWake reason =
04/06/2011 21:47:10kernelSystem Wake
04/06/2011 21:47:10kernel/drv/ MacModule.cpp:261 powerStateWillChangeTo: flags=82 stateNumber=4
04/06/2011 21:47:10kernel/drv/ MacModule.cpp:262 powerStateWillChangeTo: found flag=kIOPMPowerOn (2)
04/06/2011 21:47:10kernel/drv/ MacModule.cpp:267 powerStateWillChangeTo: found flag=kIOPMRestartCapability (80)
04/06/2011 21:47:10kernel/drv/ MacModule.cpp:261 powerStateDidChangeTo: flags=82 stateNumber=4
04/06/2011 21:47:10kernel/drv/ MacModule.cpp:262 powerStateDidChangeTo: found flag=kIOPMPowerOn (2)
04/06/2011 21:47:10kernel/drv/ MacModule.cpp:267 powerStateDidChangeTo: found flag=kIOPMRestartCapability (80)
04/06/2011 21:47:10kernelPrevious Sleep Cause: 5
amongst many others obviously!
Is there a clue there?