My MacBook Pro fan runs while sleeping

My MacBook Pro fan runs constantly, even while sleeping.
The problem started about 2-3 months ago, but was pretty rare. When I noticed the problem, I would restart the computer and it would stop for 1-2 weeks. More recently it has become more constant, and now it always has the fan running when it's sleeping.
Any ideas on what I should do? Thanks!

Mine too. If you're worried you might like to try a laptop cooler like one of these:
http://www.amazon.co.uk/s/ref=sr_kk_2?rh=i%3Aaps%2Ck%3Alaptop+cooling+pad&keywor ds=laptop+cooling+pad&ie=UTF8&qid=1344763538
Not sure how well they'd work on a Macbook as there aren't any vents on the underside but it couldn't hurt and they're quite cheep.

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    Yep, you could say that.
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    Here is the EtreCheck results:
    Problem description:
    fans running constantly and CPU slowing down
    EtreCheck version: 2.2 (132)
    Report generated 4/28/15 7:42 AM
    Download EtreCheck from http://etresoft.com/etrecheck
    Click the [Click for support] links for help with non-Apple products.
    Click the [Click for details] links for more information about that line.
    The following internal tasks failed to complete:
    /usr/sbin/system_profiler -xml SPFontsDataType
    Hardware Information: ℹ️
        MacBook Pro (15-inch, Mid 2010) (Technical Specifications)
        MacBook Pro - model: MacBookPro6,2
        1 2.66 GHz Intel Core i7 CPU: 2-core
        8 GB RAM
            BANK 0/DIMM0
                4 GB DDR3 1067 MHz ok
            BANK 1/DIMM0
                4 GB DDR3 1067 MHz ok
        Bluetooth: Old - Handoff/Airdrop2 not supported
        Wireless:  en1: 802.11 a/b/g/n
        Battery: Health = Normal - Cycle count = 141 - SN = W0020PTD7BWZA
    Video Information: ℹ️
        Intel HD Graphics - VRAM: 288 MB
        NVIDIA GeForce GT 330M - VRAM: 512 MB
            Color LCD 1440 x 900
    System Software: ℹ️
        OS X 10.8.5 (12F45) - Time since boot: 0:39:23
    Disk Information: ℹ️
        TOSHIBA MK5065GSXF disk0 : (500.11 GB)
            disk0s1 (disk0s1) <not mounted> : 210 MB
            Macintosh HD (disk0s2) / : 499.25 GB (73.74 GB free)
            Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
        MATSHITADVD-R   UJ-898 
    USB Information: ℹ️
        Apple Internal Memory Card Reader
        Apple Inc. Apple Internal Keyboard / Trackpad
        Apple Inc. BRCM2070 Hub
            Apple Inc. Bluetooth USB Host Controller
        Apple Computer, Inc. IR Receiver
    Gatekeeper: ℹ️
        Anywhere
    Kernel Extensions: ℹ️
            /Applications/KeyRemap4MacBook.app
        [loaded]    org.pqrs.driver.KeyRemap4MacBook (8.4.0 - SDK 10.8) [Click for support]
            /Applications/Roxio Toast 6 Titanium/Toast 6 Titanium.app
        [not loaded]    com.roxio.TDIXController (1.3) [Click for support]
            /System/Library/Extensions
        [not loaded]    com.IKMultimedia.driver.StompIO1 (1.0.0) [Click for support]
        [not loaded]    com.avid.usb.mbox.driver (1.0.18) [Click for support]
        [not loaded]    com.digidesign.fwfamily.driver (9.0f4) [Click for support]
        [loaded]    com.digidesign.iokit.DigiDal (10.3.4f181 - SDK 10.6) [Click for support]
        [not loaded]    com.digidesign.usb.elevenrack.driver (1.0.1) [Click for support]
        [not loaded]    com.ikmultimedia.driver.StealthPedal (1.0.0) [Click for support]
        [not loaded]    com.paceap.kext.pacesupport.master (5.9 - SDK 10.6) [Click for support]
        [not loaded]    jp.co.roland.RDUSB0138Dev (1.0.0 - SDK 10.6) [Click for support]
            /System/Library/Extensions/PACESupportFamily.kext/Contents/PlugIns
        [not loaded]    com.paceap.kext.pacesupport.leopard (5.9 - SDK 10.4) [Click for support]
        [not loaded]    com.paceap.kext.pacesupport.panther (5.9 - SDK 10.-1) [Click for support]
        [loaded]    com.paceap.kext.pacesupport.snowleopard (5.9 - SDK 10.6) [Click for support]
        [not loaded]    com.paceap.kext.pacesupport.tiger (5.9 - SDK 10.4) [Click for support]
    Startup Items: ℹ️
        DigidesignLoader: Path: /Library/StartupItems/DigidesignLoader
        RDUSB0138Startup: Path: /Library/StartupItems/RDUSB0138Startup
        Startup items are obsolete in OS X Yosemite
    Launch Agents: ℹ️
        [not loaded]    com.adobe.AAM.Updater-1.0.plist [Click for support]
        [running]    com.avid.mbox.helper.plist [Click for support]
        [loaded]    com.google.keystone.agent.plist [Click for support]
        [unknown]    com.oracle.java.Java-Updater.plist [Click for support]
        [loaded]    org.pqrs.KeyRemap4MacBook.server.plist [Click for support]
    Launch Daemons: ℹ️
        [loaded]    com.adobe.fpsaud.plist [Click for support]
        [loaded]    com.adobe.SwitchBoard.plist [Click for support]
        [running]    com.digidesign.elevenrack.helper.plist [Click for support]
        [running]    com.digidesign.fwfamily.heler.plist [Click for support]
        [loaded]    com.google.keystone.daemon.plist [Click for support]
        [unknown]    com.oracle.java.Helper-Tool.plist [Click for support]
        [loaded]    com.oracle.java.JavaUpdateHelper.plist [Click for support]
        [running]    com.paceap.eden.licensed.plist [Click for support]
        [loaded]    org.pqrs.KeyRemap4MacBook.load.plist [Click for support]
        [loaded]    PACESupport.plist [Click for support]
    User Login Items: ℹ️
        Dropbox    Application  (/Applications/Dropbox.app)
        apple-scc-20150427-140055    UNKNOWN  (missing value)
    Internet Plug-ins: ℹ️
        o1dbrowserplugin: Version: 5.41.0.0 - SDK 10.8 [Click for support]
        AdobeExManDetect: Version: AdobeExManDetect 1.1.0.0 - SDK 10.7 [Click for support]
        Flip4Mac WMV Plugin: Version: 2.3.8.1 [Click for support]
        iLokClientHelper: Version: 3.5 - SDK 10.5 [Click for support]
        Silverlight: Version: 4.0.60831.0 [Click for support]
        FlashPlayer-10.6: Version: 17.0.0.169 - SDK 10.6 [Click for support]
        Flash Player: Version: 17.0.0.169 - SDK 10.6 [Click for support]
        QuickTime Plugin: Version: 7.7.1
        googletalkbrowserplugin: Version: 5.41.0.0 - SDK 10.8 [Click for support]
        iPhotoPhotocast: Version: 7.0 - SDK 10.8
        AdobePDFViewer: Version: 10.1.1 [Click for support]
        JavaAppletPlugin: Version: 14.6.0 - SDK 10.8 Check version
    Audio Plug-ins: ℹ️
        Avid CoreAudio: Version: 10.3.4.181 - SDK 10.6 [Click for support]
    3rd Party Preference Panes: ℹ️
        Digidesign Eleven Rack  [Click for support]
        Flash Player  [Click for support]
        Flip4Mac WMV  [Click for support]
        Mbox  [Click for support]
        RC-300  [Click for support]
    Time Machine: ℹ️
        Mobile backups: ON
        Auto backup: YES
        Volumes being backed up:
            Macintosh HD: Disk size: 499.25 GB Disk used: 425.51 GB
        Destinations:
            Shupester [Network]
            Total size: 3.00 TB
            Total number of backups: 66
            Oldest backup: 2013-06-17 21:18:22 +0000
            Last backup: 2015-03-19 06:26:07 +0000
            Size of backup disk: Excellent
                Backup size 3.00 TB > (Disk size 499.25 GB X 3)
        /sbin excluded from backup!
        /usr excluded from backup!
        /System excluded from backup!
        /bin excluded from backup!
        /private excluded from backup!
        /Library excluded from backup!
        /Applications excluded from backup!
    Top Processes by CPU: ℹ️
            31%    mtmd
            19%    Safari
             8%    Finder
             6%    mds
             4%    Dropbox
    Top Processes by Memory: ℹ️
        180 MB    Mail
        172 MB    mds
        139 MB    Safari
        131 MB    WebProcess
        106 MB    Pages
    Virtual Memory Information: ℹ️
        4.72 GB    Free RAM
        3.28 GB    Used RAM
        0 B    Swap Used
    Diagnostics Information: ℹ️
        Apr 28, 2015, 06:53:27 AM    Self test - passed
        Apr 27, 2015, 11:34:56 AM    /Users/[redacted]/Library/Logs/DiagnosticReports/Pro Tools_2015-04-27-113456_[redacted].crash
        Apr 27, 2015, 11:34:23 AM    /Users/[redacted]/Library/Logs/DiagnosticReports/Pro Tools_2015-04-27-113423_[redacted].crash

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    Hey emilyiow,
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