There is an Apple Discussion about the topic I raised yesterday : Internet 
connection lost after sleep - Ethernet (although it seems to affect wireless 
connections also)

Link is here: 
http://discussions.info.apple.com/thread.jspa?threadID=2258749&start=45&tstart=0

My iMac surprisingly didn't lose connection last night so I couldn't test your 
recommendations Neil. But a couple of others that are mentioned in the Apple 
discussion, and which worked for some, are:

Turn off the Wake for network access in the Energy Saver preference
Delete these two pref files:
    Library/Preferences/SystemConfiguration/preferences.plist
    Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist

I've just done the energy saver one and I'll see how that goes before trying 
anything else.

Cheers

Mike Fuller

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