IMac wakes from sleep on its own with Yosemite

After installing Yosemite, my iMac wakes from sleep all on its own multiple times throughout the day and night. The screen does not turn on when this occurs and it goes back to sleep on its own. I figured the my energy settings may have changed after the upgrade, but nothing is different. I have no schedule set and the "wake for network access" is unchecked.

To my knowledge, any Mac that is 1. connected to power and 2. not powered down will wake periodically for the reasons I explained, and perhaps for additional reasons known only to Apple. If disabling "wake for network access" does not change anything, all I can say is that it's working as Apple intends it to work. Before you ask, I strongly discourage you from finding clever system "hacks" or workarounds to prevent your Mac from working as designed.
It may or may not be a bug. Whether it is or not though, if it bothers you, consider providing feedback to Apple.
When questions such as yours arise, it helps to look at iOS. iPads and iPhones will all periodically connect themselves for the purposes of downloading emails, Messages, alerts etc. There is no way to disable that, other than to completely power down the device, which almost no one does. Apple has been inexorably changing OS X to effectively implement iOS design features such as this – for better or worse is not for us to say.
May I ask why this concerns you? Perhaps that would lend some insight regarding possible solutions.

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cheers, Robert
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New iMac wakes from sleep sluggishly and requires password despite preference setting

My new iMac (Core i7) wakes from sleep very sluggishly and it requires a password despite the fact that I have de-selected this option in Preferences.
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I use a bluetooth mouse and wireless keyboard. Typically I click the mouse to wake up my Mac. The screen comes to life and the cursor moves with the mouse, but...how can I explain this? When I move the mouse in this situation, the cursor paints a gray swath over the desktop screen. It looks like I am using a paint program.
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I searched and read and read and didn't see a whole lot of info regarding those having their system wake from sleep and hard hanging.
Usually I 1st notice it when I see the sleep LED dimly lit. On examination the MBP is almost to hot to touch. It is unresponsive to any keys other than to hold power button till it powers down. I've had it do this while in it's sleeve as well. It should have probably therm-tripped from excessive heat, but didn't. All in all, is kind of scary to have to get so hot when it hangs like that, be it in the bag, or setting on my desk.
Background:
It is on A/C and battery is fully charged.
Sleep is configured to do so on lig closure.
Machine Name: MacBook Pro 15"
Machine Model: MacBookPro1,1
CPU Type: Intel Core Duo
Number Of Cores: 2
CPU Speed: 2.16 GHz
L2 Cache (shared): 2 MB
Memory: 1 GB
Bus Speed: 667 MHz
Boot ROM Version: MBP11.0055.B03
Serial Number: W8611186VJ3
SMC Version: 1.2f10
System Version: Mac OS X 10.4.7 (8J2135a)
Kernel Version: Darwin 8.7.1
Boot Volume: Macintosh HD
All updates are installed and all the latest firmware is also up to date.
I have wake on bluetooth disabled.
Other issues seen:
IMovie HD crashed while creating a project
IDVD creates DVD's that contain broken video/audio, even though they were fine with I MovieHD while on A/C.
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Thanks,
VG
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I think I have the same problem. The whole sequence is:
* Put MacBook Pro to sleep by closing lid.
* After some period of time that varies, I notice sleep LED is no longer pulsing.
* The case is VERY hot.
* When I open the lid, the display stays black.
* No sequence of keys or closing/opening lid wakes display.
* Only way to recover is to power cycle.
* Problem is VERY intermittant -- I do not know how to reproduce it at will. AppleCare service had it for a whole week and couldn't reproduce it, whereas for me it occurs once every 1 or 2 days.
Actions:
* AppleCare service replaced the main logic board in early June, but it didn't help.
* I did a clean erase and install, but it didn't help.
* AppleCare service had the unit for a full week in July and couldn't reproduce the problem, so they returned it and it still had the problem.
I have a Logitech Bluetooth mouse, don't know model other than M-RBB93. I'll UNset "Allow Bluetooth to wake..." and will also turn off the bluetooth mouse before closing lid. I'll post my results.
Meanwhile, please let me know if anyone determines a solution!

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I am experiencing the same issue with iPhone 3GS. After yesterday update to 3.1.2, it is a bit better in the sense that I can restart the iPhone slightly faster but still getting frozen screen during a call. I will try to call support once more. I don't believe that the problem is solved in the new update.

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I've had this same issue lately. Here's one thing to check: System Preferences > Energy Saver > Wake for Network Access should be unchecked.
Mine is unchecked, so the only other thing I can think of is that it might be Time Machine backing up. My iMac is backing up to an external hard drive, and also sharing that drive over the network so two other Macs can back up as well.
Should be an easy theory to test. Turn off AirPort, unplug Ethernet, and let the iMac sit. See if it still happens.

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I routinely wake up my computers from sleep by pressing a modifier key like shift, command, etc; these keys don't generally cause actions in whatever software is running so they make good "wakeup" buttons.
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If I wake the computer by pressing, for example, control; then wait for the system to recover before releasing it, everything's fine.
It looks like the computer is just not aware of USB activity during the waking process.
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Twice since installing Yosemite, my iMac has woken from Sleep with a completely black screen. I can see a small Apple menu logo top left and the login button but I have no control from the keyboard, trackpad or mouse.
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Thanks.

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Mac starts up from sleep on its own

Every few months, my iMac will start up from sleep mode on its own. Why does it do this, and is it something to be worried about?
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There are different things that can wake it up, every few months- I wouldn't worry about it.

IMac wakes from sleep on its own with Yosemite

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