Mac waking itself at autopoweroff stage

I recently bought the late 2012 iMac, but it is having a problem sleeping as it wakes from sleep all by itself. I have trried disabling all bluetooth, network, etc mentioned in other posts with no luck. Having a look at the console (syslog | grep -i "sleep") from last night
Jan 14 00:23:02 Benjamins-iMac kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Sleep
Jan 14 00:23:03 Benjamins-iMac kernel[0] <Debug>: Wake reason: EC.SleepTimer (SleepTimer)
Jan 14 01:33:05 Benjamins-iMac kernel[0] <Debug>: Previous Sleep Cause: 5
Jan 14 01:33:06 Benjamins-iMac kernel[0] <Debug>: hibernate image path: /var/vm/sleepimage
Jan 14 01:33:06 Benjamins-iMac kernel[0] <Debug>: AirPort_Brcm43xx::powerChange: System Sleep
Jan 14 01:33:25 Benjamins-iMac kernel[0] <Debug>: Opened file /var/vm/sleepimage, size 2147483648, partition base 0x0, maxio 400000 ssd 1
Jan 14 04:23:34 Benjamins-iMac kernel[0] <Debug>: Wake reason: EC.SleepTimer (SleepTimer)
Jan 14 04:23:34 Benjamins-iMac kernel[0] <Debug>: Previous Sleep Cause: 5
Which I then compare to pmset data (pmset -g):
Active Profiles:
AC Power                    -1*
Currently in use:
standby              1
powerbutton          1
womp                 0
halfdim              1
hibernatefile        /var/vm/sleepimage
autorestart          0
networkoversleep     0
disksleep            10
sleep                10
autopoweroffdelay    14400
hibernatemode        0
autopoweroff         1
ttyskeepawake        1
displaysleep         10
standbydelay         4200
My computer goes to sleep after 10 minutes at 00:23. After 4200 seconds (70 minutes) the mac moves onto hibernation at 01:33. Then after 14400 (4 hours) the mac moves onto the last stage at 04:23. However, for some reason something goes wrong and instead of turning off the power the mac is woken up, which then wakes me up 5 minutes later and I turn it off.
What is "autopoweroff" and can I turn it off? Is this a bug in the mac. I have the full log if anyone wants to look at it. Thanks.

Okay, well it woke up again on its own. Exact same time, at 5:26am. Bluetooth was on, but with Discoverable off. More troubleshooting in my future I guess.
Sep 3 02:13:35 Macintosh /System/Library/CoreServices/loginwindow.app/Contents/MacOS/loginwindow[9392]: Login Window Application Started
Sep 3 02:13:39 Macintosh loginwindow[9392]: Login Window Started Security Agent
Sep 3 02:13:40 Macintosh [0x0-0x63e63e].com.apple.systemevents[9403]: com.apple.FolderActions.enabled: Already loaded
Sep 3 02:13:42 Macintosh configd[13]: PMConnection AirPort configd plug-in com.apple.powermanagement.applicationresponse.slowresponse 128 ms
Sep 3 02:13:42 Macintosh configd[13]: PMConnection mDNSResponder com.apple.powermanagement.applicationresponse.slowresponse 129 ms
Sep 3 02:13:42 Macintosh configd[13]: PMConnection IPConfiguration com.apple.powermanagement.applicationresponse.slowresponse 129 ms
Sep 3 05:26:29 Macintosh configd[13]: PMConnection IPConfiguration com.apple.powermanagement.applicationresponse.slowresponse 880 ms
Sep 3 05:26:35 Macintosh configd[13]: network configuration changed.
Sep 3 05:26:37 Macintosh configd[13]: Sleep: Success - AC - Software Sleep
Sep 3 05:26:37 Macintosh configd[13]: Wake: Success - AC - EHC2
Sep 3 05:26:37 Macintosh configd[13]: Hibernate Statistics
Sep 3 05:26:40 Macintosh configd[13]: network configuration changed.
Sep 3 05:26:40 Macintosh ntpd[27]: sendto(17.151.16.23) (fd=24): Network is unreachable
Sep 3 05:40:00 Macintosh ntpd[27]: time reset -0.258826

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