MBP won't wake for access?

Hi Guys.
I use iTeleport on my iPhone.  This is an app that allows me to control my MacBook Pro, and displays the screen on my phone.  The app has a server you can download on the computer so that you can use it anywhere in the world, as opposed to only when sharing a network.  The same goes for another app called AirPlayit.  This app streams videos, photos and music to my phone from my MBP, through a server running on the MBP.
Both of these apps work fine when connecting to the macbook from outside the Local Network, but only for a short period of time.  Give it more than five minutes after the computer has gone to sleep, and it can no longer be accessed.  I've got "wake for network access" enabled in System Preferences, I've even tried setting the "Computer Sleep" to never, but that didn't work either.
I'm sure this used to work, in fact I know it did, but unfortunately I don't know what changes have been made to the computer since that time, perhaps it was updating to Lion that has disabled this feature for me somehow?
Any help with this would be greatly appreciated, thanks everyone!
Sam

Here's something you can try. No guarantee:
In particular, some users are finding success with a workaround we've suggested for various wake-from-seep and related issues -- deletion of the following files:
Home/Library/Preferences/com.apple.systemuiserver.plist
/Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist
This workaround may need to be repeated from time to time as these files can become corrupt with some frequency.
Also, check the console log using the Console application in the Utilities folder. Look for entries right around the time when you are trying to wake up the computer. See if there are any entries that may provide a clue to the problem.

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