Sleeping, whats really goin on?

Hi All,
I have a PDA which Syncs and charges via USB.
Sleep-wise I dont have many problems (except one regarding external display but that is another post).
My question in this case is this: When I shut the lid on my MBP the sleep indicator starts breathing pretty much straight away, but the connected PDA still continues to charge, thus drawing power from the MBP. This actually isnt a bad thing, but Im just curious if its normal? Shouldnt the power be cut from the USB while the device is in sleep? I'm not complaining about it as I prefer this behaviour, I just want to make sure my MBP is asleep.
The more bizarre thing, is when I unplug the PDA while the MBP is asleep and its lid is shut, the 'PDA Disconnected' sound plays through its speakers! The sleep indicator briefly pauses, then starts breathing again. So I'm guessing when I unplug the PDA the MBP wakes up, makes the sound, then goes back to sleep again. But what puzzles me is, is the sync software actually running during the sleep? checking for communication with the PDA? Is it possible to disable this? SO connecting/disconnecting USB while the lid is shut does not wake it up?
MacBook Pro C2D 17" Mac OS X (10.4.8) Week 46 Build

If you are still hearing notification sounds, then your computer is not sleeping. The light on the front next to the opening button should be pulsing bright and dim (sort of like breathing deeply) if it is sleeping. There are a number of cases where the MBP does not sleep when you close the lid. That is actually why I was looking around in the discussions here.
See http://discussions.apple.com/thread.jspa?messageID=4075416#4075416 for one discussion about problems of MBP not sleeping when you close the lid. It can be quite a problem if you close the lid and put the MBP in a bag if it is not sleeping as it can get very hot and run down the battery.
++Eric

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