Yosemite Sleep Mode ain't really sleepy...

I upgraded to Mac OS X 10.10.1 (Yosemite) on my late 2009 21.5" iMac about a week ago and I have a slight problem.
With Mountain Lion, when I put my computer in sleep mode (alt + cmd + eject or Apple > Sleep), my two monitors would go black and a little hiss would let me know the hard drive had stopped. Now, with Yosemite, the monitors go black but the hard drive keep spining. It's not really loud, but my computer is sitting on my desk about 3 feet away from my bed and the low frequency sound can become really annoying.
In the settings, I tried to check the box "Put the hard disk(s) to sleep when possible" but it doesn't change a thing. To really put the HDD to sleep, I need to shut down my iMac. I hate to do so because the booting process is long and the Apple booting chime is loud when I need to turn my Mac on early (and trying not to wake up my girlfriend).
Is there a way to get the same sleep mode than on Mountain Lion ?
Thanks a lot and happy holidays !

I also performed more tests and experienced more failure and I noticed that this problem happen quite more frequently when I use my external display (Philips 274E). I can't be sure that it happens only with an external display because it happens randomly, but in the most of times I have my display connected.

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