iMac sleeping even when set to never sleep Running 10.7.5, I've got a fairly new iMac (6 months old) 27", set to never sleep, yet when I got in to work this morning it was asleep. How to fix this?

Output from pmset -g in Terminal:

Active Profiles:
AC Power        -1*
Currently in use:
 autorestart    0
 powerbutton    0
 halfdim    1
 panicrestart   157680000
 hibernatefile  /var/vm/sleepimage
 networkoversleep   0
 disksleep  0
 sleep      0 (imposed by 139)
 hibernatemode  0
 ttyskeepawake  1
 displaysleep   15
 womp       1


And the contents of the com.apple.PowerManagement.plist in /Library/Preferences/SystemConfiguration:

&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"&gt;
&lt;plist version="1.0"&gt;
&lt;dict&gt;
    &lt;key&gt;ActivePowerProfiles&lt;/key&gt;
    &lt;dict&gt;
        &lt;key&gt;AC Power&lt;/key&gt;
        &lt;integer&gt;-1&lt;/integer&gt;
    &lt;/dict&gt;
    &lt;key&gt;Custom Profile&lt;/key&gt;
    &lt;dict&gt;
        &lt;key&gt;AC Power&lt;/key&gt;
        &lt;dict&gt;
            &lt;key&gt;Automatic Restart On Power Loss&lt;/key&gt;
            &lt;integer&gt;0&lt;/integer&gt;
            &lt;key&gt;Disk Sleep Timer&lt;/key&gt;
            &lt;integer&gt;0&lt;/integer&gt;
            &lt;key&gt;Display Sleep Timer&lt;/key&gt;
            &lt;integer&gt;15&lt;/integer&gt;
            &lt;key&gt;Display Sleep Uses Dim&lt;/key&gt;
            &lt;integer&gt;1&lt;/integer&gt;
            &lt;key&gt;Hibernate File&lt;/key&gt;
            &lt;string&gt;/var/vm/sleepimage&lt;/string&gt;
            &lt;key&gt;Hibernate Mode&lt;/key&gt;
            &lt;integer&gt;0&lt;/integer&gt;
            &lt;key&gt;PrioritizeNetworkReachabilityOverSleep&lt;/key&gt;
            &lt;integer&gt;0&lt;/integer&gt;
            &lt;key&gt;RestartAfterKernelPanic&lt;/key&gt;
            &lt;integer&gt;157680000&lt;/integer&gt;
            &lt;key&gt;Sleep On Power Button&lt;/key&gt;
            &lt;false/&gt;
            &lt;key&gt;System Sleep Timer&lt;/key&gt;
            &lt;integer&gt;0&lt;/integer&gt;
            &lt;key&gt;TTYSPreventSleep&lt;/key&gt;
            &lt;integer&gt;1&lt;/integer&gt;
            &lt;key&gt;Wake On LAN&lt;/key&gt;
            &lt;integer&gt;1&lt;/integer&gt;
        &lt;/dict&gt;
    &lt;/dict&gt;
    &lt;key&gt;LastSleepUUID&lt;/key&gt;
    &lt;dict&gt;
        &lt;key&gt;Date&lt;/key&gt;
        &lt;date&gt;2012-12-06T04:39:59Z&lt;/date&gt;
        &lt;key&gt;UUID&lt;/key&gt;
        &lt;string&gt;019EBED9-FE31-4B63-8D7A-99F41B6EB618&lt;/string&gt;
    &lt;/dict&gt;
&lt;/dict&gt;
&lt;/plist&gt;


As you can see, it has record of going to sleep this morning at 4:39 AM, yet all settings also show it's set to NOT go to sleep. Any ideas what's going on?
Do you perhaps have a schedule set to sleep the system? System Prefs > Energy Saver > Schedule button, or pmset -g sched (just sched).