IPod USB charging when iBook/Powerbook is sleeping

Hello all.
We've got two iPods (a 5G and a 4G) and two portable Macs (PowerBook and iBook).
Here's the issue: when our computers are sleeping (ie. the lids are closed), but also plugged into the wall, we could charge our old 4G iPods using the FireWire cables.
Now that one of us has upgraded to a 5G (which doesn't sync through FireWire), and the other has switched to using the USB cable to sync/charge, we've noticed that the iPods don't charge through USB when the computers are asleep but plugged in.
Is this the experience that other iPod/Mac users are having? Is there a way to force the iPods to charge when the computers are sleeping AND powered, or do iBooks and Powerbooks need to be awake to charge an iPod through USB?
I understand why a sleeping iBook or Powerbook that's NOT plugged in wouldn't charge an iPod -- it doesn't with FireWire, after all. But a computer that IS plugged in? How inconvenient if I had to open my computer every time I'm trying to charge up the iPod!
Please advise. Thanks.

Powering a device through the USB bus requires that the CPU on the host machine be active in order to arbitrate power for different devices and warn the operator if a device is drawing too much power from the bus. Since the CPU doesn't do anything while the computer is asleep, devices cannot be powered while the host is asleep. Power used by FireWire devices is drawn directly from the power supply and doesn't need any information from the CPU while the computer is plugged in. When on battery power, FireWire ports are shut off while the computer is asleep to save battery time.
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