Macbook won't always wake from sleep

Occasionally my Alu Macbook won't wake up from sleep. The keyboard backlight comes on, but the display won't wake. Sometimes the machine is quite hot and the fans are blasting too. Only a power cycle will fix it and then there's a message about OS X restarting unexpectedly.
Any ideas?
Thanks

Interesting how a common thread I see on these failures is 4GB ram upgrades. I too have a 4GB aftermarket RAM kit in my late 07 black MB. No issues with this machine, having this exact hardware / RAM configuration for 1+ years. My problems started about the time I ran the 10.5.6 upgrade, which may or may not have included a firmware update.
I would be inclined to think memory timing issues or undervolting the RAM during sleep which causes it to corrupt. Perhaps the OEM RAM modules are looking for different timings / voltage than Apple provided RAM modules.
All said, I am VERY confident this is not a hardware defect but instead firmware related. It doesn't appear to be OS related as none of these failures are making it into the console logs - the machine is asleep, deeeeep sleep. For all intents when it starts it is as if it lost complete power and starts from hibernation file (or starts from scratch if you didn't have a hibernation file...

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    Anonymous UUID:                    8AA886FB-EB63-4507-B919-EB3827C02A31
    Thu Oct 20 09:07:20 2011
    Machine-check capabilities (cpu 6) 0x0000000000001c09:
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    IA32_MC3_STATUS(0x40d): 0x0000000000000000 invalid
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    IA32_MC5_STATUS(0x415): 0x0000000000000000 invalid
    IA32_MC6_STATUS(0x419): 0x0000000000000000 invalid
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    Package 1 logged:
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    R12: 0xffffff7f8087d490, R13: 0xffffff8022a1ebc0, R14: 0x0000000000000006, R15: 0xffffff7f80879d18
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    0xffffff814872efb0 : 0xffffff80002d0238
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             com.apple.driver.AppleIntelCPUPowerManagement(142.6.0)@0xffffff7f80860000->0xff ffff7f80883fff
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    System model name: MacPro5,1 (Mac-F221BEC8)
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    jp.co.roland.RDUSB012ADev          1.0.0
    com.apple.filesystems.afpfs          9.7.1 - last loaded 26694620804799
    com.apple.nke.asp_tcp          5.0
    com.apple.filesystems.autofs          2.1.0
    com.apple.driver.AppleTyMCEDriver          1.0.2d2
    com.apple.driver.AGPM          100.12.31
    com.apple.driver.AppleHWSensor          1.9.3d0
    com.apple.driver.AudioAUUC          1.57
    com.apple.driver.AppleUpstreamUserClient          3.5.7
    com.apple.driver.AppleMCCSControl          1.0.20
    com.apple.driver.AppleMikeyHIDDriver          1.2.0
    com.apple.kext.ATIFramebuffer          6.3.6
    com.apple.Dont_Steal_Mac_OS_X          7.0.0
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    com.apple.ATIRadeonX3000          6.3.6
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    com.apple.driver.AudioIPCDriver          1.1.6
    com.apple.driver.AppleHDA          2.0.5f14
    com.apple.driver.AppleBluetoothMultitouch          54.3
    com.apple.driver.AirPortBrcm43224          428.42.4
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    com.apple.iokit.IOAHCIBlockStorage          1.6.4
    com.apple.driver.AppleFWOHCI          4.7.3
    com.apple.driver.AppleUSBEHCI          4.2.4
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    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
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    com.apple.driver.AppleSMBIOS          1.7
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    com.apple.driver.AppleProfileReadCounterAction          17
    com.apple.driver.AppleProfileTimestampAction          10
    com.apple.driver.AppleProfileThreadInfoAction          14
    com.apple.driver.AppleProfileRegisterStateAction          10
    com.apple.driver.AppleProfileKEventAction          10
    com.apple.driver.AppleProfileCallstackAction          20
    com.apple.iokit.IOSurface          74.2
    com.apple.iokit.IOBluetoothSerialManager          2.4.5f3
    com.apple.iokit.IOSerialFamily          10.0.3
    com.apple.driver.DspFuncLib          2.0.5f14
    com.apple.iokit.IONDRVSupport          2.2.1
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    com.apple.driver.IOBluetoothHIDDriver          2.4.5f3
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    com.apple.driver.AppleUSBAudio          2.7.6f6
    com.apple.iokit.IOAudioFamily          1.8.3fc2
    com.apple.kext.OSvKernDSPLib          1.3
    com.apple.iokit.IOFireWireIP          2.0.3
    com.apple.iokit.AppleProfileFamily          41
    com.apple.driver.AppleHDAController          2.0.5f14
    com.apple.iokit.IOGraphicsFamily          2.2.1
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    com.apple.iokit.IONetworkingFamily          1.10
    com.apple.driver.AppleSMC          3.1.0d5
    com.apple.driver.IOPlatformPluginFamily          4.7.0a1
    com.apple.driver.AppleSMBusPCI          1.0.10d0
    com.apple.driver.AppleUSBHIDKeyboard          141.5
    com.apple.driver.AppleHIDKeyboard          141.5
    com.apple.driver.BroadcomUSBBluetoothHCIController          2.4.5f3
    com.apple.driver.AppleUSBBluetoothHCIController          2.4.5f3
    com.apple.iokit.IOBluetoothFamily          2.4.5f3
    com.apple.iokit.IOUSBHIDDriver          4.2.0
    com.apple.driver.AppleUSBMergeNub          4.2.4
    com.apple.driver.AppleUSBComposite          3.9.0
    com.apple.iokit.IOSCSIMultimediaCommandsDevice          2.6.8
    com.apple.iokit.IOBDStorageFamily          1.6
    com.apple.iokit.IODVDStorageFamily          1.6
    com.apple.iokit.IOCDStorageFamily          1.6.1
    com.apple.driver.XsanFilter          402.1
    com.apple.iokit.IOUSBUserClient          4.2.4
    com.apple.iokit.IOAHCISerialATAPI          1.2.6
    com.apple.iokit.IOSCSIArchitectureModelFamily          2.6.8
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    com.apple.iokit.IOAHCIFamily          2.0.6
    com.apple.iokit.IOUSBFamily          4.2.4
    com.apple.driver.AppleEFIRuntime          1.4.0
    com.apple.iokit.IOHIDFamily          1.6.6
    com.apple.iokit.IOSMBusFamily          1.1
    com.apple.security.TMSafetyNet          6
    com.apple.kext.AppleMatch          1.0.0d1
    com.apple.driver.DiskImages          289
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    14/03/2012 20:07:12.000 kernel: AppleACPICPU: ProcessorId=1 LocalApicId=1 Enabled
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    14/03/2012 20:07:12.000 kernel: calling mpo_policy_init for Sandbox
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    14/03/2012 20:07:12.000 kernel: calling mpo_policy_init for Quarantine
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    14/03/2012 20:07:12.000 kernel: Copyright (c) 1982, 1986, 1989, 1991, 1993
    14/03/2012 20:07:12.000 kernel: The Regents of the University of California. All rights reserved.
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    14/03/2012 20:07:12.000 kernel: ACPI: System State [S0 S3 S4 S5] (S3)
    14/03/2012 20:07:12.000 kernel: PFM64 (36 cpu) 0xf10000000, 0xf0000000
    14/03/2012 20:07:12.000 kernel: [ PCI configuration begin ]
    14/03/2012 20:07:12.000 kernel: console relocated to 0xf10060000
    14/03/2012 20:07:12.000 kernel: PCI configuration changed (bridge=5 device=1 cardbus=0)
    14/03/2012 20:07:12.000 kernel: [ PCI configuration end, bridges 7 devices 17 ]
    14/03/2012 20:07:12.000 kernel: AppleIntelCPUPowerManagement: (built 18:56:37 Jan 12 2012) initialization complete
    14/03/2012 20:07:12.000 kernel: Sleep failure code 0x00002000 0x27006c00
    14/03/2012 20:07:12.000 kernel: FireWire (OHCI) TI ID 8025 built-in now active, GUID 002332fffe089a52; max speed s800.
    14/03/2012 20:07:12.000 kernel: mbinit: done [64 MB total pool size, (42/21) split]
    14/03/2012 20:07:12.000 kernel: Pthread support ABORTS when sync kernel primitives misused
    14/03/2012 20:07:12.000 kernel: com.apple.AppleFSCompressionTypeZlib kmod start
    14/03/2012 20:07:12.000 kernel: com.apple.AppleFSCompressionTypeDataless kmod start
    14/03/2012 20:07:12.000 kernel: com.apple.AppleFSCompressionTypeZlib load succeeded
    14/03/2012 20:07:12.000 kernel: com.apple.AppleFSCompressionTypeDataless load succeeded
    14/03/2012 20:07:12.000 kernel: AppleIntelCPUPowerManagementClient: ready
    14/03/2012 20:07:12.000 kernel: BTCOEXIST off
    14/03/2012 20:07:12.000 kernel: wl0: Broadcom BCM4328 802.11 Wireless Controller
    14/03/2012 20:07:12.000 kernel: 5.10.131.36
    14/03/2012 20:07:12.000 kernel: [IOBluetoothHCIController::setConfigState] calling registerService
    14/03/2012 20:07:12.000 kernel: rooting via boot-uuid from /chosen: 6C08D56F-818F-3F88-8945-E2ED19162954
    14/03/2012 20:07:12.000 kernel: Waiting on <dict ID="0"><key>IOProviderClass</key><string ID="1">IOResources</string><key>IOResourceMatch</key><string ID="2">boot-uuid-media</string></dict>
    14/03/2012 20:07:12.000 kernel: Got boot device = IOService:/AppleACPIPlatformExpert/PCI0/AppleACPIPCI/SATA@1F,2/AppleICH8AHCI/PR T0@0/IOAHCIDevice@0/AppleAHCIDiskDriver/IOAHCIBlockStorageDevice/IOBlockStorageD river/Hitachi HTS723232L9SA62 Media/IOGUIDPartitionScheme/Macintosh HD@2
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    14/03/2012 20:07:12.000 kernel: jnl: unknown-dev: journal replay done.
    14/03/2012 20:07:12.000 kernel: Kernel is LP64
    14/03/2012 20:07:12.000 kernel: AppleYukon2: Marvell Yukon Gigabit Adapter 88E8055 Singleport Copper SA
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    14/03/2012 20:07:12.000 kernel: hfs: Removed 24 orphaned / unlinked files and 3 directories
    14/03/2012 20:06:45.006 com.apple.launchd: *** launchd[1] has started up. ***
    14/03/2012 20:07:11.432 com.apple.launchd: (com.apple.sandboxd) Unknown value for key POSIXSpawnType: Interactive

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    Thank you for using Apple Support Communities.
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