Mini hibernates despite pmset saying it shouldn't

Question

Hello. My new (late 2012) Mac Mini is great, but I've noticed that after putting it to sleep, an hour later it wakes again (although not the displays) to write everything in memory to disk.  I'd rather turn this off (it seems a bit pointless given I have 16GB RAM and it just creates a ~20 or so pause when I start the Mini up again whilst it reads everything back off the disk.  Also if I did ever have a power cut, there'd be just as much chance of it happening whilst I was actually using the computer as when it was sleeping, so...)
Anyway, the output below says 'hibernatemode' is set to zero, which from everything I've read suggests it shouldn't be using it.
wt-macmini:~ wt$ pmset -g
Active Profiles:
AC Power                    -1*
Currently in use:
standby              1
powerbutton          1
womp                 0
autorestart          0
hibernatefile        /var/vm/sleepimage
networkoversleep     0
disksleep            10
sleep                180
autopoweroffdelay    14400
hibernatemode        0
autopoweroff         1
ttyskeepawake        1
displaysleep         30
standbydelay         4200
Any suggestions?
Thanks,
William

Answer 1

This was happening to my, after alot of searching I found out it's the "AutoPowerOff = 1" and AutoPowerOffDelay = 14400" thats causing it to switch off/go into hibernation mode.
Use this command in terminal to turn it off:
sudo pmset -a autopoweroff 0
This is what my pmset -g is set to.
Active Profiles:
AC Power        -1*
Currently in use:
standby              0
powerbutton          1
womp                 1
autorestart          0
hibernatefile        /var/vm/sleepimage
networkoversleep     0
disksleep            0
sleep                15
autopoweroffdelay    14400
hibernatemode        0
autopoweroff         0
ttyskeepawake        1
displaysleep         15
standbydelay         4200