2010 iMac having sleep problems

I have a late-2010 21.5" iMac (3.2GHz Intel Core i3 / 8GB RAM) running OS X 10.9.2
It's always been very well behaved and never had any problems. However, since upgrading to Mavericks recently, it's been having some sleeping issues.
Whilst asleep, the computer will 'semi wake up' – basically I can hear the hard drive whirr into life, but the screen remains off. It does this for about 1 minute, then goes back to sleep again.
It didn't bother me, I assumed it was a new feature like Power Nap (?), where the mac was doing something like waking up to check emails in the background, without properly waking up.
However, recently, the mac will stay in this half-awake state, and there's nothing I can do. So the hard drive is spinning, the mac is getting really hot, but the screen is off. It remains unresponsive to any keyboard or mouse input. It stays like this for as long as possible – until I hold down the power button to force a shut down.
It's becoming frequent. Should I be worried? Anything I can try to fix it? I was considering a blank Mavericks install...
Thanks

Thanks for the tip. Here's the results...
Hardware Information:
iMac (21.5-inch, Mid 2010)
iMac - model: iMac11,2
1 3.2 GHz Intel Core i3 CPU: 2 cores
8 GB RAM
Video Information:
ATI Radeon HD 5670 - VRAM: 512 MB
System Software:
OS X 10.9.2 (13C1021) - Uptime: 0 days 2:11:52
Disk Information:
ST31000528AS disk0 : (1 TB)
EFI (disk0s1) <not mounted>: 209.7 MB
Macintosh HD (disk0s2) / [Startup]: 999.35 GB (400.4 GB free)
Recovery HD (disk0s3) <not mounted>: 650 MB
OPTIARC DVD RW AD-5680H
USB Information:
Line 6 TonePort UX1
Apple Internal Memory Card Reader
Apple Inc. BRCM2046 Hub
Apple Inc. Bluetooth USB Host Controller
Western Digital Ext HDD 1021 2 TB
EFI (disk1s1) <not mounted>: 209.7 MB
Time Machine 2TB (disk1s2) /Volumes/Time Machine 2TB: 2 TB (1.16 TB free)
Apple Computer, Inc. IR Receiver
Apple Inc. Built-in iSight
Thunderbolt Information:
Gatekeeper:
Mac App Store and identified developers
Kernel Extensions:
[kext loaded]     at.obdev.nke.LittleSnitch (4052 - SDK 10.8) Support
[kext loaded]     com.Cycling74.driver.Soundflower (1.6.6 - SDK 10.6) Support
[kext loaded]     com.line6.driver.xtaudio (7.3.6 - SDK 10.7) Support
[not loaded]     com.wacom.kext.pentablet (5.2.5) Support
Launch Daemons:
[running]     at.obdev.littlesnitchd.plist Support
[loaded]     com.adobe.fpsaud.plist Support
[loaded]     com.adobe.SwitchBoard.plist Support
[running]     com.line6.l6ksettingmgr.plist Support
[invalid]     com.oracle.java.Helper-Tool.plist
Launch Agents:
[running]     at.obdev.LittleSnitchUIAgent.plist Support
[not loaded]     com.adobe.AAM.Updater-1.0.plist Support
[running]     com.adobe.AdobeCreativeCloud.plist Support
[loaded]     com.adobe.CS5ServiceManager.plist Support
[invalid]     com.oracle.java.Java-Updater.plist
[running]     com.wacom.pentablet.plist Support
User Launch Agents:
[failed]     com.apple.CSConfigDotMacCert-[...]@me.com-SharedServices.Agent.plis t
[loaded]     com.google.keystone.agent.plist Support
[running]     com.spotify.webhelper.plist Support
User Login Items:
Growl
LittleIpsum
Dropbox
Google Drive
Alfred
Google Chrome
Color Picker
Internet Plug-ins:
WacomNetscape: Version: 1.1.1-1 Support
Default Browser: Version: 537 - SDK 10.9
Flip4Mac WMV Plugin: Version: 3.2.0.16   - SDK 10.8 Support
AdobeAAMDetect: Version: AdobeAAMDetect 2.0.0.0 - SDK 10.7 Support
FlashPlayer-10.6: Version: 11.7.700.225 - SDK 10.6 Support
Silverlight: Version: 5.1.20913.0 - SDK 10.6 Support
Flash Player: Version: 11.7.700.225 - SDK 10.6 Outdated! Update
QuickTime Plugin: Version: 7.7.3
iPhotoPhotocast: Version: 7.0 - SDK 10.8
AdobeExManCCDetect_x86_64: Version: AdobeExManCCDetect_x86_64 1.0.0.0 - SDK 10.7 Support
AdobePDFViewer: Version: 10.1.1 Support
JavaAppletPlugin: Version: 14.9.0 - SDK 10.7 Check version
Audio Plug-ins:
BluetoothAudioPlugIn: Version: 1.0 - SDK 10.9
AirPlay: Version: 2.0 - SDK 10.9
AppleAVBAudio: Version: 203.2 - SDK 10.9
iSightAudio: Version: 7.7.3 - SDK 10.9
iTunes Plug-ins:
Quartz Composer Visualizer: Version: 1.4 - SDK 10.9
User Internet Plug-ins:
Google Earth Web Plug-in: Version: 7.1 Support
3rd Party Preference Panes:
PenTablet Support
Flash Player Support
Flip4Mac WMV Support
Line6AudioMIDI Support
Time Machine:
Auto backup: YES
Volumes being backed up:
Macintosh HD: Disk size: 930.71 GB Disk used: 557.81 GB
Destinations:
Time Machine 2TB [Local] (Last used)
Total size: 2
Total number of backups: 96
Oldest backup: 2011-12-11 18:14:17 +0000
Last backup: 2014-04-28 21:31:42 +0000
Size of backup disk: Adequate
Backup size 2 > (Disk used 557.81 GB X 3)
Time Machine details may not be accurate.
All volumes being backed up may not be listed.
Top Processes by CPU:
    9%     mds
    1%     WindowServer
    0%     Little Snitch Network Monitor
    0%     Dropbox
    0%     Plex Media Server
Top Processes by Memory:
279 MB     mds_stores
164 MB     com.apple.IconServicesAgent
147 MB     Google Chrome
131 MB     softwareupdated
98 MB     Dropbox
Virtual Memory Information:
3.12 GB     Free RAM
2.40 GB     Active RAM
1.68 GB     Inactive RAM
814 MB     Wired RAM
930 MB     Page-ins
0 B     Page-outs

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http://support.apple.com/en-us/TS5357
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