IMac wake from sleep problem

I have an Intel imac that I've had for about 9 months. It is on a normal sleep setting and I usually wake it from sleep by moving the mouse.
In the past 3 weeks, though, I have had to wake it up by pressing the space bar. When I do this the computer pauses for a moment and I hear something wind down (I would say it is the hard drive, but the tone of the sound actually goes down rather than up - as if something got stuck on its way to sleeping).
Any ideas about this ? I also had the computer go to sleep yesterday and not wake up (led lights on screen were on, but nothing on the screen). I powered it down and tried to turn it back on, but same result (backlight on, but no boot up). I finally had to pull the power plug and restart the computer with the power button depressed. This seemed to shake up the computer and get it running again.
My sleep problem, though, is still the same. I'm not sure if these issues are related or not, but looking for some feedback on possible issues...
Thanks, Mark

Hi Mark
+The System Management Controller (SMC) is a chip on the logic board that controls all power functions for your computer. If your computer is experiencing any power issue, resetting the SMC may resolve it. The SMC controls several functions, including:+
+* Telling the computer when to turn on, turn off, sleep, wake, idle, and so forth.+
+* Handling system resets from various commands.+
+* Controlling the fans.+
If you are still having any of the above issues reset the SMC as described in the following article!
http://support.apple.com/kb/HT1543
Dennis

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