Random iMac "back from sleep" beep

Hi...
When my iMac is idle and not asleep, it will randomly give the faint "beep" like it's coming back awake from sleep mode. It will do this every couple minutes, or even a couple times a minute. Any ideas?
Powerbook G4 / Intel iMac 2.0   Mac OS X (10.4.8)  

I've never had a Mac make a beep sound when it wakes from sleep. I am not familiar with which you refer.

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