Having Macbook Pro sleep/fan Issues

SUMMARY: Macbook Pro eventually loses ability to sleep properly, will begin to constantly wake with fans at full speed and then quickly go back to sleep, back and forth every 30 seconds while the lid is closed. Restarting fixes the issue but it always comes back after a day or two. Help?
I only occasionally shut down my Macbook Pro - usually I just close the lid and let it sleep when I'm away. But I've noticed that, after a while from my last shutdown/startup, it has trouble staying in sleep mode when the lid is closed. Initially it will sleep and the light will begin to fade in and out like normal, but after about a minute the light will come back on and the fans will suddenly boost to full speed, then quiets down and the unit sleeps again. This cycle repeats every 30 seconds or so, so I'll come home to find my MBP hot and quickly fading in and out of sleep mode. When I open the lid, the screen comes on immediately, then fades to black. I have to hit a key or something to get it to wake up properly.
Any idea what's happening here? I have a feeling it might be software-related.

Try these first:
Resetting your Mac's PRAM and NVRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
If neither hels then reinstall OS X:
Reinstall OS X without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.

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I got a call from apple yesterday to say that the screws for my machine were in, and that they had got a response from engineering about the fans, they said that the fan speeds were normal and there was nothing to worry about.
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Free Memory: 2.44 GB
Wired Memory: 561.3 MB
Used Memory: 1.43 GB
Inactive Memory: 185.8 MB
Total VM: 137.72 GB
Number of processes: 55
PID    Process Name              User       CPU      Real Mem        Virtual Mem
0      kernel_task               root       5.9      200.7 MB        2.39 GB
1      launchd                   root       0.0      1.3 MB          2.36 GB
10     kextd                     root       0.0      5.5 MB          2.36 GB
11     DirectoryService          root       0.0      5.5 MB          2.36 GB
12     notifyd                   root       0.0      640 KB          2.34 GB
13     syslogd                   root       0.0      768 KB          2.36 GB
14     configd                   root       0.0      3.5 MB          2.38 GB
15     blued                     root       0.0      4.5 MB          2.36 GB
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17     distnoted                 daemon     0.0      1.4 MB          2.35 GB
18     mDNSResponder             _mdnsrespo 0.0      2.4 MB          2.36 GB
23     securityd                 root       0.0      2.7 MB          2.36 GB
26     ntpd                      root       0.0      1.1 MB          2.32 GB
27     krb5kdc                   root       0.0      2.0 MB          2.35 GB
31     usbmuxd                   _usbmuxd   0.0      2.1 MB          2.36 GB
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42     hidd                      root       1.4      1.6 MB          2.35 GB
43     fseventsd                 root       0.0      2.0 MB          2.36 GB
45     dynamic_pager             root       0.0      796 KB          2.32 GB
52     autofsd                   root       0.0      1.0 MB          2.34 GB
55     PocketCloudService        root       0.0      3.5 MB          637.8 MB
56     vpnagentd                 root       0.0      3.2 MB          621.0 MB
73     coreservicesd             root       0.3      20.2 MB         2.38 GB
75     WindowServer              _windowser 3.7      52.6 MB         3.02 GB
78     TiVoDesktop               root       0.1      57.6 MB         908.9 MB
84     cvmsServ                  root       0.0      852 KB          2.33 GB
97     coreaudiod                _coreaudio 0.0      2.7 MB          2.36 GB
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105    SystemUIServer            Lease      0.0      20.5 MB         2.71 GB
106    Finder                    Lease      0.1      15.1 MB         2.66 GB
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163    mdworker                  Lease      0.0      11.8 MB         2.38 GB
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188    Activity Monitor          Lease      5.6      28.9 MB         2.76 GB
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Hello, LeaseBL.
Thank you for visiting Apple Support Communities.
Try resetting the System Management Control to see if the fan noise ceases. Also, make sure there are no obstructions to the fan as well as the portable is on a flat surface when in use.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Cheers,
Jason H.

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