I have figured out why this is happening ! Im using a program called NetAdmin Pro and it "sniffs" my local subnetwork for devices. Once it finds a device it will try to see what ports are available on the device... As soon as it discovers the Apple TV, it starts testing the ports that its "listening on" and the following come up as active...DAAP ( airplay ) 3689/tcp, RAOP (airplay - remote audio output protocol) 7000/tcp, Mediaremotetv 7000/tcp and 53716/tcp, Iphone Sync 62078/tcp, and Sleep Proxy server 53058/udp...
So my guess is it is definitely one of these ports that is being "ping'd" and the response is to "wake up" from the Apple TV... So if this is happening to you, either you have some device on your home network that is aware of the apple tv and is trying to wake it up so it can connect to it, or, you have some type of malware on a machine on your network, or lastly , your wifi network has been breached and whom ever it is, is sniffing around using a tool like I have to root around looking for something to "play with"
Hope this helps someone....