Imac, when sleeping, makes noise??

I have had this Imac for about 7 months. Whenever I put it to sleep, it will make that low grumble sound like once you wake it, and the light spin sound as if the disk is spinning. It does this about every 20-3- minutes. Not 100% sure on the time intervals, but it happens. The screen doesn't wake, but it makes noise, not a loud sound, but a sound nonetheless.
Anyone heard this before? How would I put a stop to this, or figure out what exactly is causing it?

I had the same issue on a Imac 27", after a search i found out that by unpluging everything from the USB (got some wireless receiver for my logitech gaming mice) ports , it suddenly stopped making any sound, before that  there was always the hard drive making noises, could also be the fan.
Anyway, now my mac is finally sleeping...

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    com.intego.netbarrier.kext.process                 653
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    com.apple.driver.AppleHWSensor                 1.9.5d0
    com.apple.driver.AGPM    100.14.15
    com.apple.driver.AppleTyMCEDriver          1.0.2d2
    com.apple.filesystems.autofs            3.0
    com.apple.driver.AppleBluetoothMultitouch             80.14
    com.apple.iokit.IOBluetoothSerialManager                 4.2.3f10
    com.apple.driver.AppleMikeyHIDDriver    124
    com.apple.driver.AppleMikeyDriver             2.6.0f1
    com.apple.driver.AppleHDAHardwareConfigDriver                2.6.0f1
    com.apple.driver.AppleHDA            2.6.0f1
    com.apple.iokit.IOUserEthernet     1.0.0d1
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    com.apple.Dont_Steal_Mac_OS_X   7.0.0
    com.apple.driver.AppleBacklight  170.3.5
    com.apple.driver.AppleLPC             1.7.0
    com.apple.driver.AppleHWAccess                  1
    com.apple.driver.AppleUpstreamUserClient               3.5.13
    com.apple.driver.AppleMCCSControl           1.1.12
    com.apple.kext.AMDFramebuffer  1.2.0
    com.apple.driver.ACPI_SMC_PlatformPlugin              1.0.0
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    com.apple.driver.AppleIRController             325.7
    com.apple.driver.AppleUSBCardReader     3.4.1
    com.apple.driver.AppleFileSystemDriver   3.0.1
    com.apple.AppleFSCompression.AppleFSCompressionTypeDataless                 1.0.0d1
    com.apple.AppleFSCompression.AppleFSCompressionTypeZlib         1.0.0d1
    com.apple.BootCache         35
    com.apple.iokit.SCSITaskUserClient               3.6.6
    com.apple.driver.XsanFilter             404
    com.apple.iokit.IOAHCIBlockStorage             2.5.1
    com.apple.driver.AppleUSBHub    666.4.0
    com.apple.iokit.AppleBCM5701Ethernet   3.8.1b2
    com.apple.driver.AppleFWOHCI   4.9.9
    com.apple.driver.AppleAHCIPort  3.0.0
    com.apple.driver.AirPort.Atheros40              700.74.5
    com.apple.driver.AppleUSBUHCI  656.4.1
    com.apple.driver.AppleUSBEHCI  660.4.0
    com.apple.driver.AppleRTC             2.0
    com.apple.driver.AppleACPIButtons             2.0
    com.apple.driver.AppleHPET         1.8
    com.apple.driver.AppleSMBIOS     2.1
    com.apple.driver.AppleACPIEC     2.0
    com.apple.driver.AppleAPIC           1.7
    com.apple.driver.AppleIntelCPUPowerManagementClient  216.0.0
    com.apple.nke.applicationfirewall                 153
    com.apple.security.quarantine       3
    com.apple.driver.AppleIntelCPUPowerManagement               216.0.0
    com.apple.driver.AppleBluetoothHIDKeyboard        170.15
    com.apple.driver.AppleHIDKeyboard           170.15
    com.apple.kext.triggers     1.0
    com.apple.driver.IOBluetoothHIDDriver    4.2.3f10
    com.apple.driver.AppleMultitouchDriver  245.13
    com.apple.iokit.IOSerialFamily       10.0.7
    com.apple.driver.DspFuncLib         2.6.0f1
    com.apple.vecLib.kext        1.0.0
    com.apple.iokit.IOAudioFamily      1.9.5fc2
    com.apple.kext.OSvKernDSPLib     1.14
    com.apple.iokit.IOSurface                  91
    com.apple.iokit.IOBluetoothFamily                4.2.3f10
    com.apple.driver.AppleGraphicsControl     3.4.35
    com.apple.iokit.IOBluetoothHostControllerUSBTransport     4.2.3f10
    com.apple.driver.AppleBacklightExpert     1.0.4
    com.apple.driver.AppleSMBusPCI                  1.0.12d1
    com.apple.iokit.IOFireWireIP          2.2.6
    com.apple.driver.AppleHDAController        2.6.0f1
    com.apple.iokit.IOHDAFamily         2.6.0f1
    com.apple.driver.AppleSMBusController   1.0.11d1
    com.apple.driver.AppleSMC            3.1.8
    com.apple.driver.IOPlatformPluginLegacy                  1.0.0
    com.apple.driver.IOPlatformPluginFamily                  5.7.0d10
    com.apple.iokit.IONDRVSupport   2.4.1
    com.apple.iokit.IOAcceleratorFamily             98.14
    com.apple.kext.AMDSupport           1.2.0
    com.apple.AppleGraphicsDeviceControl     3.4.35
    com.apple.iokit.IOGraphicsFamily                  2.4.1
    com.apple.iokit.IOUSBHIDDriver   660.4.0
    com.apple.iokit.IOSCSIBlockCommandsDevice          3.6.6
    com.apple.iokit.IOUSBMassStorageClass      3.6.0
    com.apple.driver.AppleUSBMergeNub         650.4.0
    com.apple.driver.AppleUSBComposite         656.4.1
    com.apple.iokit.IOSCSIMultimediaCommandsDevice               3.6.6
    com.apple.iokit.IOBDStorageFamily               1.7
    com.apple.iokit.IODVDStorageFamily           1.7.1
    com.apple.iokit.IOCDStorageFamily               1.7.1
    com.apple.iokit.IOAHCISerialATAPI               2.6.1
    com.apple.iokit.IOSCSIArchitectureModelFamily      3.6.6
    com.apple.iokit.IOUSBUserClient   660.4.2
    com.apple.iokit.IOEthernetAVBController  1.0.3b4
    com.apple.driver.mDNSOffloadUserClient                   1.0.1b5
    com.apple.iokit.IOFireWireFamily                  4.5.5
    com.apple.iokit.IOAHCIFamily        2.6.5
    com.apple.iokit.IO80211Family    630.35
    com.apple.iokit.IONetworkingFamily            3.2
    com.apple.iokit.IOUSBFamily           675.4.0
    com.apple.driver.AppleEFINVRAM                2.0
    com.apple.driver.AppleEFIRuntime              2.0
    com.apple.iokit.IOHIDFamily           2.0.0
    com.apple.iokit.IOSMBusFamily     1.1
    com.apple.security.sandbox             278.11
    com.apple.kext.AppleMatch             1.0.0d1
    com.apple.security.TMSafetyNet    7
    com.apple.driver.AppleKeyStore   2
    com.apple.driver.DiskImages          371.1
    com.apple.iokit.IOStorageFamily   1.9
    com.apple.iokit.IOReportFamily     23
    com.apple.driver.AppleFDEKeyStore            28.30
    com.apple.driver.AppleACPIPlatform           2.0
    com.apple.iokit.IOPCIFamily            2.9
    com.apple.iokit.IOACPIFamily         1.4
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