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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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Can you please run pmset -g assertions in Terminal (/Applications/Utilities/Terminal.app) and post the output in a comment? –  XAleXOwnZX Mar 27 at 22:15
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2 Answers 2

up vote 0 down vote accepted

In /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/

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ehc2 appears about once an hour, i tried unchecking "wake using bluetooth mouse and keyboard" but didnt change a thing overnight. –  user74238 Mar 28 at 19:24
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go to safari in the top left hand corner and-prefrences-enable javascript. and turn down your brightness and turn it off then turn it back on and it shouldnt do that again.

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