New iMac won't sleep with internet sharing on

Less than 3 month old iMac (core i5) has stoppped being able to sleep when Internet Sharing is enabled. It took me a good while to narrow it down to that but I've confirmed that when Internet sharing is off, it will sleep as it's supposed to. When sharing is on though, not only will it not automatically sleep per the energy saver setting, it wo'nt even sleep when forced with the Apple command. The display will turn off, but the machine does not sleep. I can tell by the facts that my wifi access on my iPhone continues to run off the iMac, and the Caps lock on the keyboard remains lit. (Too bad the blinking LED is no more on the new iMacs).
Sleep was working fine when I first got the new machine; it seems to have stopped shortly after I upgraded to Lion. (I think it may have been working for a few days after installing Lion, but I'm not positive...I'm thinking now I just thought it was asleep because the display would turn off.)
I've looked at all the related sleep posts I could find but nothing seems to address this particular issue. I know I could just turn off sharing whenver I want it to sleep, but tha't's like having to disconnect my car battery when I want to shut the car off.
Any help is appreciated.
Thanks,
Jamie

Well, I'm certainly no expert at this and I'd never enable internet sharing (being too concerned about the health of my Mac and/or not knowing what untoward sites/networks/people may be seeking access), but it seems to me that having it turned on means that your computer is sharing a connection, so anytime anyone on the network seeks access, it will either wake up the Mac or cause it to stay awake. Here is an excerpt from the Help Menu (in Finder) (which has nothing to do with your question, but I found it interesting nonetheless):
If your Internet connection and your local network use the same port (Ethernet, for example), investigate possible side effects before you turn on Internet sharing. In some cases (if you use a cable modem, for example) you might unintentionally affect the network settings of other ISP customers, and your ISP might terminate your service to prevent you from disrupting its network.

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