IMac and Airport Express

I just purchased Airport Express and now my IMac is WI Fi. I've noticed that it comes on even though I have not tried to wake it up. Does this mean I need to turn the machine completely off when I'm done? I prefer to leave it in a sleep mode since I'm on and off my Mac most of the time.  I also have an IPad 2 and Apple TV on this network. Any feed back would be appreciated.  Thank you....

I'd start with unchecking the option,  System Preferences > Energy Saver > "Wake for network access".
See if that works and go from there.
Regards,
Captfred

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