I have a hard drive connected to my dad's Mac Mini media server downstairs. It is shared over the network and used for time machine backups. However, for some reason sometimes my Mac isn't able to connect to it and the only way to get it to work is to wake the Mini from sleep. I have even got an Airport Extreme Apple router recently, and it still won't wake the mini from sleep when my Mac requests access to it. (I know that wake on network access is one of the features of this router.) The same thing happens with iTunes home sharing, I sometimes use my Apple TV to access the media from iTunes on the Mini but again sometimes it will not connect unless I go and manually wake the mac from sleep. My Apple TV also sometimes randomly turns itself on, the white light comes on but it doesn't actually turn on, which is also quite weird and has been happening since I got the new router. I have got the setting 'wake on network access' turned on on the Mini, so I don't see any reason why this should not work.