Regularly while sleeping my Mac wakes up and i'd like to know if there is some kind of log of what trigged the waking. (Mouse click ? Keyboard ? WOL Magic Packet ? Something else ?)

I'm on late 2012 iMac with 10.8.3

PS: "Wake for network access" is enabled.

  • How about the bluetooth mouse and keyboard. My guess is there's a setting that allows them to wake the computer and that setting is adjustable.
    – Richard
    Commented May 10, 2013 at 14:02
  • I only use the Bluetooth Keyboard, the mouse is Wired. FYI it's on the mouse's LED that I see that the Mac is on. (Screen stays off). But I'l try disabling the option you mentioned. Commented May 10, 2013 at 17:54
  • Do you have a wireless or wired LAN?
    – cahuk
    Commented May 10, 2013 at 22:28
  • I use only my Ethernet connection. Commented May 11, 2013 at 0:08
  • Then disable "Wake for network access". See if you still have the issue. I can not use this option because probably my WRT54GL wakes my iMac from sleep.
    – cahuk
    Commented May 11, 2013 at 19:51

2 Answers 2


In System Preferences under Energy Saver, is there a check in the checkbox for Enable Power Nap while plugged into a power adapter?

If so, then this is possibly why your iMac is waking up. The description of Power Nap in System Preferences says: "While sleeping, your Mac can back up using Time Machine and periodically check for new email, calendar, and other iCloud updates".

  • It's not a MacBook therefore I haven't PowerNap Commented May 10, 2013 at 13:18
  • Yikes! You are correct, Power Nap is a laptop-only feature - my apologies! Source: support.apple.com/kb/ht5394
    – Nate
    Commented May 10, 2013 at 13:20

I'll answer to myself

syslog |grep -i "Wake reason"

gives the wake reason from the syslog for example : RTC, GiGE, Bonjour etc.


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