IMac takes half a minute to go to sleep

When I logout from my account, I often then go to put it to sleep, but more often than not, when I click the sleep button, nothing happens. I wait for thirty seconds and then the screen goes black. If this was normal behavior, the screen would show some sort of feedback, right? I don't know what would be keeping the iMac awake, and I can't check from the login screen.

Hello Macky,
Is this a 2012 iMac or newer? It may be trying to write a sleepimage.
See if it's related to the opposite problem...
See if it's related to this...
The 2012 macs (and later apparently) not waking normally from sleep after hours being in sleep. (noted here ...
http://www.xlr8yourmac.com/archives/feb13/022813.html#2012macswontwake
"Why 2012 iMac/2012 Mac Mini won't Wake After Hours of Sleep (Hibernates/Powers Off)")
The sleepimage file still reappears even if never slept. Delete it (hibernate off, etc) - within minutes its back.
A note on that here - http://www.xlr8yourmac.com/feedback/Chameleon_SSD_Optimizer.html
About iMac sleep...
http://forums.macrumors.com/showthread.php?t=1529750

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      iMac 1680 x 1050
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      OS X 10.10 (14A389) - Uptime: 4 days 22:43:39
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      Apple Inc. BRCM2046 Hub
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      SharePointBrowserPlugin: Version: 14.4.6 - SDK 10.6 Support
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      iPhotoPhotocast: Version: 7.0
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      Mobile backups: OFF
      Auto backup: NO - Auto backup turned off
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      Total number of backups: 11
      Oldest backup: 2012-08-02 18:29:31 +0000
      Last backup: 2014-03-07 21:41:18 +0000
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          0% WindowServer
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      64 MB Google Chrome Helper
      27 MB mds
      19 MB System Events
      17 MB WindowServer
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      599 MB Wired RAM
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      575 MB Page-outs

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