IMac mysteriously wakes from Sleep

Hi, I have had this problem with my iMac where when I put it to sleep, it will mysteriously wake up at 7pm, even when no one is home. At first I thought someone at home was trying to get into my computer because every time I came home, I'd find my computer awake, and it bothered me. Then I realized that even if someone was not home, it would wake at that time anyway. What is going on? What is happening, why is it doing that? Should I be worried? I came across this post:
http://discussions.apple.com/message.jspa?messageID=5826698#5826698
Is this what I need to do? I just wanted to make sure before I did something stupid.
Thanks

Well, It's certainly been awhile, and I have forgotten about it as well, but remember it from time to time. I said I would post back, and I am posting back.
Unfortunately, I have had it wake maybe a couple times since I put in that command, but not nearly as "predictable" or often as prior to the terminal workaround. I am unsure if there is a complete fix to this yet myself. If there is, please let me know. It may have been solved in the 10.5.5 update, I have no clue, I haven't had it wake unexpectedly within the past month, so I don't know if the problem is still there or not.
Thanks.

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27" iMac only wakes from sleep on second attempt

My 27" iMac, as the title suggest only wakes from sleep on the second attempt. If I wake the mac in the usual way(magic mouse, keyboard or power button), I hear the hard drive start but the screen stays blank. If i then press the power button it will put the mac back into sleep then if i then wake it up again everything comes on fine. This only seems to happen if the mac has been sleeping for longer than a few minutes, but it does happen every single time.
I've obviously checked that the bluetooth devices are allowed to wake the machine. Ive been looking through various forums and haven't come across anyone with the same problem as me so far.
Ive already tried resetting the smc,pram etc to no avail.
Any ideas on what could be the problem?
Thanks
Message was edited by: ScreamingMusings

Sorry, I get it now.
If you are using the Screen Saver prior to auto-sleep, then try disabling it to see if that helps.
If not then the only other thing I can suggest is to backup and reinstall the OS X or call Apple Support.

OS X 10.7.3 WiFi Update for iMacs and Wake from Sleep Problem

http://support.apple.com/kb/DL1501
Apple has released a software update for those suffering from the iMac wake from sleep/wifi connection issue that resulted from updating to 10.7.3. It fixes the problem for me and several others. For those still suffering this issue, download it and see how it works!

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I see a couple threads on this here, but they seem to be associated with bluetooth keyboards.
I have a new 27" iMac Core i5 (about 2 months old) and a new problem started this past week. When the computer display goes to sleep, I cannot wake it up. The only way I have found to wake it up is by tapping the power button to force a full hard drive sleep and then clicking the mouse. This is also time consuming (it takes a minute to wake up).
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Hi Michael
Reset the SMC > http://support.apple.com/kb/HT3964
+1. Shut down the computer.+
+2. Unplug the computer's power cord.+
+3. Press and hold the power button for 5 seconds.+
+4. Release the power button.+
+5. Attach the computers power cable.+
+6. Press the power button to turn on the computer.+
and then test to see if it is working as expected?
If not, then check and try the following:
1. A tap on the keyboard should wake the display, is the keyboard plugged into a port on the back of the iMac or into a Hub?
2. Your profile shows that you are running 10.6.2? Either way if the computer is or is not up to date download and install the 10.6.6 Combo Update. > http://support.apple.com/kb/DL1349
3. Then run a Software Update.. to make sure that iTunes, Safari, Java and your Printer are up to date.
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6. Turn on your Bluetooth devices and let them connect to your Mac
7. Try and put your Mac to sleep and then wake with the power button
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9. Try and restart your Mac and check again if the "Allow Bluetooth devices to wake this computer" option is still unchecked (I had mixed results with this test, depending on the type of the Mac being tested)
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You might try looking at these Apple support articles:
http://support.apple.com/kb/PH11099
http://support.apple.com/kb/PH10662 - very simple suggestions only
Here is another thread with a suggestion:
https://discussions.apple.com/message/18848093#18848093
You also might want to consider filing a feedback report. A lot of people are having similiar problems:
http://www.apple.com/feedback/
If you monitor the "More Like This" box (top right), other threads appear. Opening them usually displays other threads.

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Here is another thread with a suggestion:
https://discussions.apple.com/message/18848093#18848093
You also might want to consider filing a feedback report. A lot of people are having similiar problems:
http://www.apple.com/feedback/
If you monitor the "More Like This" box (top right), other threads appear. Opening them usually displays other threads.

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IMac mysteriously wakes from Sleep

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