Alu iMac stuck in SLEEP / Blank screen problem! Please Help!

I have a 24" 2.4GHz Alu iMac. I usually sleep my computer quite often at night instead of a full shutdown (although I make sure I shutdown completely a couple of times a week).
Recently I have gone to wake my iMac up in the morning only to get no response from keyboard / mouse. Upon a closer look I have realized that the imac is actually awake as I can hear the fans running, so it has woken by itself at some point during the night even though there is nothing on screen and no response to keyboard/mouse. I have then had to force it to shut down, something I hate having to do.
I've verified and repaired disk permissions, verified and repaired disk, reset the SMC, all without any change. There are external drives plugged in to firewire ports but none of these are on when problem happens. I have tried unplugging the drives when the imac is not responsive but it still fails to "wake". Although I have a wireless keyboard and mouse, they have full battery power and during short periods of sleep wake the imac up with no problems, it seems it's the long overnight periods that causes the problem. Is the time of night a factor perhaps? I herd something about imacs doing automatic maintenance at 4 in the morning or something? As I said before I have always slept my imac for long periods without problems, this is a recent thing the happened suddenly, perhaps coinciding with an update, I'm not sure.
I have created a new post as I am sure the iMac is not technically "sleeping" at the point of no response, so I don't want to it to get confused with potentially another issue of imacs not waking from sleep (although some of the people experiencing sleep problems may have imacs doing what mine is without realizing!).
Has anyone else experienced the above?
Thanks guys.

HI Joey,
Try resetting the PRAM/VRAM. http://support.apple.com/kb/HT1379
*"Is the time of night a factor perhaps? I herd something about imacs doing automatic maintenance at 4 in the morning or something? "*
Yes, your iMac if turned on will run "cron" tasks (maintenance), but it can run while the computer is sleeping. Here's the schedule for it. *"These tasks are scheduled for 03:15 to 05:30 in your computer's local time zone. "* More info here. http://support.apple.com/kb/HT2319?viewlocale=en_US
Check System Preferences/EnergySaver and click the Sleep tab. Click the Schedule tab and make sure you don't have a startup / wake scheduled.
*"Although I have a wireless keyboard and mouse, they have full battery power and during short periods of sleep wake the imac up with no problems,"*
Check System Preferences/Bluetooth. Click the Advanced tab. Do you have the; Allow Bluetooth devices to wake this computer selected?
Check System Preferences/Security and click the General tab. Do you have the; Require password to wake this computer from sleep or screen saver selected?
Carolyn

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