Does a G4 dream..?

(This might belong in the "older hardware" section but i think it's equally likely to be an OS 9 issue.)
What i'm wondering is: Does the G4 actually sleep..? How about a G3..? What does "sleep" mean..? Isn't the processor always running its little execution loop waiting for you to press <power> and wake the computer up..? Or is the CPU actually powered down to wait for an interrupt or something when you want to wake it up..?
I have an 8500 upgraded with a Sonnet G4 card. Is the problem that it's not a built-in CPU..? The CPU doesn't seem to go to sleep, although the hard drives power down and the screen turns off. In Sleeper 3.5 (which i'm using instead of Energy Saver control panel), the option for "Sleep" is grayed-out, yet Energy Saver supposedly does put the computer (=CPU?) to "sleep".
When i press power, the screen flashes on instantly which i don't think it would do if the CPU were actually asleep. How can you tell if a CPU is asleep anyway, if indeed they do actually "sleep"..?
It's very stressful knowing that my G4 may actually be staying awake all night, zipping along at 800MHz and doing nothing. Did anyone see the 2007 movie "Awake"?

"The CPU doesn't seem to go to sleep, although the hard drives power down and the screen turns off."
The G4 "AGP Graphics" (AKA Sawtooth) and later Macs are capable of "deep sleep", where the Mac appears to be shut down except for the pulsing power button.
Earlier Macs have a "lighter" sleep mode, where the drives spin down but the fans keep running.
"What i'm wondering is: Does the G4 actually sleep..? How about a G3..? What does "sleep" mean..? Isn't the processor always running its little execution loop waiting for you to press <power> and wake the computer up..? Or is the CPU actually powered down to wait for an interrupt or something when you want to wake it up..?"
According to a document I found on Motorola/Freescale's website, G4 745x processors (1GHz to 1.4Ghz) draw roughly 8 watts in each of the three different sleep modes it listed, so they are not powered down completely in sleep mode.
I don't know about slower G4s or G3s.

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