While using mac as wireless router ; How to make Mac sleep?

Hi all.
I set up my macbook to act as a wireless router [sharing it's wireless signal, via the "Sharing" settings in System Preferences]
using this guide
http://www.macinstruct.com/node/118
I am wondering how to make my mac sleep while this wireless-sharing setting is enabled?
Since I have enabled this setting, the mac will not sleep, however, the mac will sleep when I disable it.
I am also wondering ; [if it is possible to make the mac sleep while this setting is enabled], can I still use the mac as a wireless router even while it is asleep?
Or does it need to be awake to function as a router?
Thanks very much in advance for any help!

Thank you very much everybody for your answers.
Dominic23
and
BobTheFisherman
Yes, I kind of thought what you are saying would be the case.
It makes "sense" that when the computer is asleep, so are all it's functions,
but I *WISH* there was an option to keep the airport functioning even while the computer is asleep.
Bob, I don't think having the OPTION to leave the airport on while mac sleeps would defeat the power-saving feature of the computer (:
I know the "best" way to share wifi is with a router, but for me, a router just another piece of plastic I don't need. All I need to do is share wifi in a small space [my room] from my mac to my iPad and ipod touch.
I like to use my ipad as a reader, and when I am reading, I may be sitting down for many hours just reading from the ipad. It doesn't make sense to leave the mac running during these long periods just for a wireless signal, so I may sadly buy a router ):
Anyway, I get what you are all saying, and thank you for telling me the current limits of this function.
Cheers! (:

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