My iMac freezes after installation of Mavericks

My iMac set. with the new Mavericks has started freezing, or going into sleep mode, and will not wake up.  I have to hold the power button in for about ten seconds to force it to close down, wait a few seconds, the press power button again and it will boot normally.
It will sometimes just freeze the screen, and other times go to a blank screen.  Nothing will wake it up.
<Personal Information Edited by Host>

I have had consistent freezes after my MBP (15 in 2.4/2.2 GHz) goes to sleep since I installed Mavericks.  When it's frozen, the fan is going hard, but nothing will wake it up -- not mouse motion, key presses (including "force quit" chord), closing and opening lid, etc.  I have to force a shutdown with the power button, and restart it. 
The only thing I've found to prevent the freeze is to prevent going to sleep.  There's nothing that I recognize as suspicious in the console log.  I've reinstalled Mavericks, I've fixed permissions, I've repaired the hard drive, I've removed plugins.  I don't know what else to try.  So I'm looking for suggestions, please!

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        SharePointBrowserPlugin: Version: 14.4.5 - SDK 10.6 Support
        Silverlight: Version: 5.1.20913.0 - SDK 10.6 Support
        JavaAppletPlugin: Version: Java 8 Update 25 Check version
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        Flash Player  Support
        Flip4Mac WMV  Support
        Java  Support
    Time Machine: ℹ️
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    Top Processes by CPU: ℹ️
            87%    plugin-container
            29%    firefox
            24%    System Preferences
            11%    WindowServer
             0%    fontd
    Top Processes by Memory: ℹ️
        527 MB    firefox
        125 MB    Finder
        95 MB    WindowServer
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        77 MB    CalendarAgent
    Virtual Memory Information: ℹ️
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        1.56 GB    Inactive RAM
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        877 MB    Page-ins
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