Mac Pro won't wake for network access & streaming

I used to enjoy streaming media from my G5 to various UPnP devices, as well as streaming videos to my iPhone using Air Video and accessing the G5 from my MacBook over my home network, and over the internet using Back to my Mac. But after upgrading to a Mac Pro, I find it no longer wakes from sleep mode for network access of this kind. I can stream media and access it from my notebook while it’s awake, but when it goes to sleep after ten minutes, it disappears from the MacBook’s Finder sidebars and can no longer be reached with UPnP or Air Video.
Can anyone shed any light on this? Does the Mac Pro (or maybe Snow Leopard) sleep more deeply, and if so, is there any way around this? For the record, I have the Wake for Network Access box checked in Energy Saving preferences, and my network is controlled through a FRITZ!Box router; I don’t have a Time Capsule or AirPort Express.

If your still around or for anyone else:
Well, believe it or not sometimes you may have to enable and then re-enable it for it to "take".
It doesn't happen very often but every once in a while it seems to rear it's ugly head. It seems to be hit or miss on what program it comes up on.
Try going back into the "Energy Saver" (10.6.x) settings and un-check the box and then re-check it again, or un-check it then close the window then open it again and re-check the box.
Hope it was that easy...

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