There are a bazillion reasons for a machine to wake up. There is no standard method to discover which one it was but you can learn about the OS in use and if it is Windows then research the EVENT VIEWER tool to see if the event is noted.
Hi my laptop is on a wireless network and it often makes that Windows startup chime sound when it's just sitting there closed on standby, which creeps me out a little....Does this mean someone else is accessing my network, or am I just paranoid? My desktop never does this. (I'm having trouble getting my network secured, I follow all the steps to secure it, and it remains unsecured-- but that's a whole 'nother question.) Thanks all.