My 27" iMac wakes up from sleep randomly, even though I went through the "energy saver" preference pane, and bluetooth is only active for my mouse and keyboard.
What could be causing this?
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/Applications/Utilities/ run Terminal.app, then type this command:
syslog |grep -i "Wake reason"
What do you see?
The codes listed here might give you a clue as to what is going on: http://osxdaily.com/2010/07/17/why-mac-wakes-from-sleep/